Another syntax which has the same meaning, obsolete since GCC 2.5, is 'fieldname:', as shown here: Your compiler should have similar documentation. I cannot use memset() function as it increments the pointer by 2 bytes. Alternately perhaps your compiler doesn't actually value-initialize POD structures. If an objectthat has static storage duration is not initializedexplicitly, then: if it has pointer type, it is initialized to a nullpointer; if it has arithmetic type, it is initialized to (positive orunsigned) zero; if it is an aggregate, every member is initialized(recursively) according to these rules; if it is a union, the firstnamed member is initialized (recursively) according to these rules. When initializing a struct, the first initializer in the list initializes the first declared member (unless a designator is specified) (since C99), and all subsequent initializers without designators (since C99) initialize the struct members declared after the one initialized by the previous expression. I was always attracted by the simplicity of C there always seemed to be just enough language to get the job done, with a bit of flexibility for style. The compiler throws no errors. I mentioned, that non-IEEE formats may not interpret zeroed FP variable as 0. Alternatively you can use the default constructor. How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? So, we can write: This is quite clear, but, in an embedded context, we might like to ponder exactly how this initialization takes place. In terms of structures, this means that the structure cannot have any private/protected members, user-provided constructors, base classes, or virtual member functions (see this great post for an explanation). What is instantiated when a POD structure is declared without using a default constructor? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Did the apostolic or early church fathers acknowledge Papal infallibility? According to, Quality Considerations of Open-Source Software for Medical, Traditionally, software intended to run on a medical device was expected to be written by companies well versed in writing, This article first appeared on the Siemens Digital Industries Software blog at https://blogs.sw.siemens.com/embedded-software/2021/03/08/initializing-structures-in-c/, Digital Powers Flexible: Consumer Products Podcast, Startups: Digitalization to Realization Podcast, The Voice of Smart Digital Manufacturing Podcast, Click here to choose content that's right for you, Chicago Pixels Semiconductor Research Center. Find centralized, trusted content and collaborate around the technologies you use most. (2) The issue under discussion is whether . As new features have been added to the language, I have worried that C will become increasingly bloated and its original appeal will be lost. Was the ZX Spectrum used for number crunching? I am doing member by member initialization. If you want to make it clear what each initializer value is, just split it up on multiple lines, with a comment on each: Because of the initialization rules of C, it's kind of a universal initializer:it will initialize numbers or pointers as well as aggregates (=structs/unions) or arrays by setting everything (every member recursively) to zero. Why do quantum objects slow down when volume increases? Windows Dev Center Home ; UWP apps; Get started; Design; Develop; Publish Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? Other FP representations may (and probably will) differ in that matter. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How to initialize a struct in accordance with C programming language standards. Sometimes when initializing large arrays of structures, especially when there is an identifiable pattern, it can be efficient to use program code with loops to set things up. How can I use a VPN to access a Russian website that is banned in the EU? I believe valgrind is complaining because that is how C++ used to work. Clone this repo and run the code yourself with cpp/run_struct_initialization.sh Initializing default values in a struct ***** [my own answer, which demonstrate this sort of struct modification/aggregate member reassignment within any function: leds [0] = {10, 20, 30, 40, 50};] Arduino Stack Exchange: Initializing Array of structs Share To learn more, see our tips on writing great answers. However, C structures have some limitations. Under these circumstances, some code must be included so that, on start up, data is copied into the initialized variables. C99 and C++ allow the initializer for an automatic member variable of a union or structure type to be a constant or non-constant expression. In C, we initialize or access a structure variable either through dot . The initializer is preceded by an equal sign ( = ). struct ex1 {int x = 0;} Two problems with your reply: (1) C/C++ compilers handle struct member initialization quite well, thank you. Why copy constructor is not called in this case? How to initialize private static members in C++? @LvZheng You should probably read more about initialization and conversions between numerical values. As a side note: rev2022.12.11.43106. ah i see now how you meant it originally. This procedure is similar to that for initializing arrays. A non POD struct may as well have a constructor so it can initialize members. See. A structure can be declared in the following way. In any case probably the simplest solution is to write constructor(s) as needed for the struct/subparts. For example consider the following code: C# {}) and inside it an equal sign (=) followed by the values must be in the order of members specified also each value must be separated by commas. It is possible to pass an entire structure, individual elements of structure, and address of structure to a function. Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). What properties should my fictional HEAT rounds have to punch through heavy armor and ERA? or arrow -> operator. I have generally reviewed the new features and ignored those that are inapplicable or unwise for embedded use. It is clearly very good programming practice to initialize a variable before use and this is probably best done when the variable is declared. Archived Forums > Visual C . Connect and share knowledge within a single location that is structured and easy to search. FYI: "it just accidentally happens, that zeroed value is equal to 0". This is guaranteed as per section 6.7.8 of the C standard (with highlighting specific to this case): 10 If an object that has automatic storage duration is notinitialized explicitly, its value is indeterminate. Need help struct-void error: type name isn't allowed. In context of initialization, value will be implicitly converted as required. When should you use a class vs a struct in C++? All the data members inside a structure are accessible to the functions defined outside the structure. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This question was voluntarily removed by its author. ABC abc = { 0 //initializes all members to 0 }; Last example works only, if all members of this struct can be initialized with value of integral type (which is true in this particular case). Do non-Segwit nodes reject Segwit transactions with invalid signature? - Michael Karas Mar 16, 2020 at 16:42 You can also use function-like macros if you want to hide some of the complexity and make things more configurable. C# program to read the grade of students and print the appropriate description of grade. - Artelius I am wondering if there's an efficient way of doing this initialization. In this video, learn What is Structure Initialization in C Programming - Explained | C Tutorials in Hindi. A struct can be a non-POD and a class can be a POD, these concepts are orthogonal. Japanese girlfriend visiting me in Canada - questions at border control? Is it possible to hide or delete the new Toolbar in 13.1? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In case of IEEE 754 it just accidentally happens, that zeroed value is equal to 0. How to initialize all members of an array to the same value? Windows Dev Center. Find centralized, trusted content and collaborate around the technologies you use most. Find all the videos of the Complete C++ Programmin. Of course initializing an anonymous structure like this would not allow you to create more than one version of the structure type without specifically typing another version, but if that's all you were wanting, then it should do the job. Just after structure declaration put the braces (i.e. Does a 120cc engine burn 120cc of fuel a minute? What does = { 0 }; mean in a structure initialization in C? C allows us to initialize more complex objects, like arrays: int a [3] = {10, 20, 30}; and structures: struct s { int s1; int s2; int s3; }; struct s m = {1, 2, 3}; It is also possible to initialize just the initial elements of an array, leaving the remainder uninitialized [and probably 0]: int a [3] = {10, 20}; What is the correct way to initialize a very large struct? Connect and share knowledge within a single location that is structured and easy to search. When should I use a struct rather than a class in C#? struct C { int x; int y; }; C c = {0}; // Zero initialize POD Alternatively you can use the default constructor. Initializing structures By MeraMind On October 12, 2018 Leave a comment Like other C variable types, structures can be initialized when they're declared. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? : Since it's a POD struct, you could always memset it to 0 - this might be the easiest way to get the fields initialized (assuming that is appropriate). Japanese girlfriend visiting me in Canada - questions at border control? Share Follow edited Oct 7, 2011 at 18:35 answered Oct 7, 2011 at 18:12 Jason 31.3k 7 56 77 Is there any reason on passenger airliners not to have a physical lock between throttles? You declare it without an initializer, then run a statement to set one field. Difference between 'struct' and 'typedef struct' in C++? To initialize a variable, you have to give it a value at the time it is defined: One you do this, then you'll see the contents of myStruct.sj set to 0. Not the answer you're looking for? there's no difference between "class" and "struct" in C++, except for the default protection (private and public, resp.). 2022 ITCodar.com. Also, There is no exact floating point zero. IEEE754 floats are designed such that "all bits zero" is. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, As I understand things, you should not get that error message. Share Follow edited Aug 1, 2015 at 13:53 answered Aug 1, 2015 at 11:59 Mateusz Grzejek 11.4k 3 32 48 1 memset (., 0, .) Why is the eastern United States green if the wind moves from west to east? For block scope objects on platforms where the null pointer is "all bits zero" (most platforms), it's equivalent to memset(&object,0,sizeof(object)); and compilers will often generate such a memset call for {0} initializations, particularly when such initializations are applied to a larger object. However [and this is the feature of which I was previously unaware], you can do this with structures: Although this adds little benefit in this trivially simple example, it would make for quite readable code with a large, complex structure. Because of that, you may want to initialize this struct as every POD-type: Last example works only, if all members of this struct can be initialized with value of integral type (which is true in this particular case). Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? Can you post the definition of MyStruct? By adding private in front of them, just like a normal class. Visual C . For example, following is a valid initialization. The array implicitly will be initialized with zeroes. Is my understanding flawed here, or is Valgrind throwing false positives? A structure creates a data type that can be used to group items of possibly different types into a single type. Can you reduce your code to the smallest program that still demonstrates this behavior, and post that distilled program? During debug I confirmed the struct remains empty. Ready to optimize your JavaScript with Rust? Notice that compund literals were introduced in C99. Last I heard, it still has the same behaviour as C. IIRC, the MSVC compiler even dropped zero-initialising uninitialised members at some point (for performance reasons, I assume), which apparently created rather severe problems for the other MS divisions :). Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. In your example adding an extra variable happened to cause myStruct.sj to be 0, but there's no guarantee that this will be the case. C allows us to initialize more complex objects, like arrays: It is also possible to initialize just the initial elements of an array, leaving the remainder uninitialized [and probably 0]: Whilst I cam imagine situations where doing this with an array might make sense, it would be hard to imagine that being able to do the same with an array would make sense, but you are allowed to do it: There is no mechanism for initializing arbitrary array members, only the initial ones. should initialize all the values to zero, as does: However, when the struct is initialized in the second way, Valgrind later complains "conditional jump or move depends on uninitialised value(s)" when those variables are used. When I retrieve the values using Dequeue, I receive nothing. This is the most easiest way to initialize or access a structure. Structure types should, whenever practical, either have all of their state encapsulated in public fields which may independently be set to any values which are valid for their respective type, or else behave as a single unified value which can only bet set via constructor, factory, method, or else by passing an instance of the struct as an explicit ref parameter to one of its public methods. Good Read:C and C++ : Partial initialization of automatic structure. I'm trying to test a generic queue implementation in C++, but the struct "RegistyEntry" remains empty during the test phase inside main(), even after assigning values to it's fields. What is the easiest way to initialize a std::vector with hardcoded elements? You are not initializing myStruct. Of course, over that time the language has developed and a selection of new standards have emerged. Does integrating PDOS give total charge of a system? will just clear all bits. The structure declaration is followed by an equal sign and a list of initialization values is separated by commas and enclosed in braces. In C++ classes/structs are identical (in terms of initialization). However, sometimes code is executed out of some read-only memory. It was a surprise when I stumbled across a feature which looks neat and useful, that must have been sneaked in at some point . There are five distinct numerical ranges that single-precision floating-point numbers are not able to represent: Thanks for contributing an answer to Stack Overflow! Structure Initialization in C/C++. That seems to me the easiest way. (See. rev2022.12.11.43106. Asking for help, clarification, or responding to other answers. making +0.0 equal to integer 0 allowed to use the same test and quick clear memory (yes, @Olaf Question was about a particular case, which does not involve pointers. I have a structure which has different data types as members like int, float, bool. Your best bet is to add a constructor that initializes the object (structs are allowed constructors). All Rights Reserved. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. If there are fewer initializers in a brace-enclosed list than there are elements or members of an aggregate, or fewer characters in a string literal used to initialize an array of known size than there are elements in the array, the remainder of the aggregate shall be initialized implicitly the same as objects that have static storage duration. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Why Do All Qt Objects Need This MACro, Is There a Difference Between Universal References and Forwarding References, What Is Indeterminate Behavior in C++ ? compilers do not have AI that good, so you need to explicitly initialize any variables eg. In this case, we should use the initializer list-style syntax with an additional cast notation as a prefix. Are you able to simplify your code into a postable example that still flags the valgrind error? That creates a distinction between an uninitialized struct, which has its default value and an initialized struct, which stores values set by constructing it. Is it possible that some subpart of your struct isn't actually POD and that's preventing the expected initialization? Can a prospective pilot be negated their certification because of too big/small hands? Perhaps your data structure is not a POD? In the old days, floating point units were rare, so floats had to be often calculated in software. I cannot use memset() function as it increments the pointer by 2 bytes. What's the difference between struct and class in .NET? The general form of structure declaration is as follows datatype member1; struct tagname { datatype member2; datatype member n; }; Here, struct is the keyword. Here are some similar questions that might be relevant: If you feel something is missing that should be here, contact us. With a desktop computer, the program image is read from disk into memory, with variables containing their initial values. Making statements based on opinion; back them up with references or personal experience. Can several CRTs be wired in parallel to one oscilloscope circuit? I have been using C for over 30 years; using it, teaching it, writing about it, supporting users. Connect and share knowledge within a single location that is structured and easy to search. operator Initialization at Declaration Structure variables can be initialized at the same time they are declared, just like normal variables and arrays. To access the data members in the main function, you need to create a structure variable. Here's the code: Asking for help, clarification, or responding to other answers. How to directly initialize a HashMap (in a literal way)? Fortunately, C gives us some simple syntax to achieve this. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The first is easiest(involves less typing), and it is guaranteed to work, all members will be set to 0[Ref 1].The second is more readable. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? Received a 'behavior reminder' from manager. Our code involves a POD (Plain Old Datastructure) struct (it is a basic c++ struct that has other structs and POD variables in it that needs to get initialized in the beginning.). Would salt mines, lakes or flats be reasonably found in high, snowy elevations? Especially, as IEEE 754 states: -0 and +0 are distinct values, though they both compare as equal. @RockyRaccoon The difference here and with the question you link to in your comment; is that in this case there are no parameters used in the construtor. The C structure does not allow the struct data type to be treated like built-in data types: We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Do the parentheses after the type name make a difference with new? If you require a parameter in the constructor then the compiler can see this is a variable declaration without any issues. Making statements based on opinion; back them up with references or personal experience. If your struct is a POD then you can use an initializer. In ISO C99 you can give the elements in random order, specifying the array indices or structure field names they apply to, and GNU C allows this as an extension in C90 mode as well. The members of a structure can be of any data type including the basic type, array, pointer and other structures. In C language, Structures provide a method for packing together data of different types. You can use a pointer to a compound literal: Deploying Qt Applications in Linux Properly, How to Get Memory Information on Linux System, Overriding a Base's Overloaded Function in C++, How to Create Minidump for My Process When It Crashes, Is Adding to a "Char *" Pointer Ub, When It Doesn't Actually Point to a Char Array, How to Properly Replace Global New & Delete Operators, How to Solve "Unresolved Inclusion: " in a C++ File in Eclipse Cdt, Why Can't the Compiler Deduce the Template Type from Default Arguments, What Exif Lib How to Use from a Qt Program (On Embedded Linux), How Do Objects Work in X86 at the Assembly Level, Why Is a Boolean 1 Byte and Not 1 Bit of Size, How to Overload Operators for Built-In Types Like Int or Float, How to Access a Text File While Debugging with Eclipse Cdt, Libstdc++ Static Linking in Dynamic Library, Using Input Function in C on Linux, Without Pressing Enter, What Does the Q_Object MACro Do? Accessing struct pointer within another struct in C. Struct initialization and default values A variable of a struct type directly contains the data for that struct. For example, given the following structure. Thanks for contributing an answer to Stack Overflow! stackoverflow.com/questions/2750270/c-c-struct-vs-class, https://www.geeksforgeeks.org/structures-in-cpp/. This means that seemingly unrelated changes can modify this behavior. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Counterexamples to differentiation under integral sign, revisited, Received a 'behavior reminder' from manager. C 1972 Structure Initialization. A Computer Science portal for geeks. Yes, you can use memset() - it doesn't "increment" anything: The only problem with this approach is that setting all bits of floating point numbers does not mean, that their value will be equal to 0. So write for example. QGIS expression not working in categorized symbology. Not sure if it was just me or something she sent to the whole team. In C++ classes/structs are identical (in terms of initialization). Structure Initialization in C It can be initialized in various ways Method 1: Specify the initializers within the braces and seperated by commas when the variables are declared as shown below: struct Student { char name[25]; int age; char branch[10]; //F for female and M for male char gender; }S1 = {"John",14,"CSE","M"}; You need to initialize whatever members you have in your struct, e.g. A structure can be defined as a single entity holding variables of different data types that are logically related to each other. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. From what you've told us it does appear to be a false positive in valgrind. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Syntax: struct structure_name {1st member; 2nd member;.. nth member;}; The struct keyword is used to declare structures. Standard C90 requires the elements of an initializer to appear in a fixed order, the same as the order of the elements in the array or structure being initialized. What is a structure? malloc doesn't look to work in my program. What do you mean how? Is there any difference between struct Data d = {0} and struct Data d = {}. C# program to demonstrate the example of the right shift operator. To be able to use the C structure initialization via curly braces, the structure needs to be an aggregate. If your struct is a POD then you can use an initializer. Structure members can be initialized using curly braces {}. That was no accident, but clever design. memset() is not the best option, you can zero-initialize a POD struct by just calling its default ctor. In some ways, I preferred a precursor of C, BCPL, but that is another story. Do you have a reference for this zero-initialising of variables in C++? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Because the variable is uninitialized, its contents are undefined, and reading it is undefined behavior. Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). Mathematica cannot find square roots of some matrices? You have to explicitly assign 0.0 to it. Because of the initialization rules of C, it's kind of a universal initializer: it will initialize numbers or pointers as well as aggregates (= struct s/ union s) or arrays by setting everything (every member recursively) to zero. i2c_arm bus initialization and device-tree overlay. What compiler? The 'struct' keyword is used to create a structure. Why isn't sizeof for a struct equal to the sum of sizeof of each member? To learn more, see our tips on writing great answers. A structure is a user-defined data type in C/C++. How to print struct variables in console? So indeed, their internal representation needs to be different (and thus, neither of them may have all bits set to 0). Many embedded systems copy an image from flash to RAM on start up, so the same approach can apply. Does a 120cc engine burn 120cc of fuel a minute? How to set a newcommand to be incompressible by justification? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Irreducible representations of a product of two groups. It chooses forward function declaration. (I am not exactly sure when C++ was upgraded with the zero initialization default construction). Not sure if it was just me or something she sent to the whole team. Are there known false positives issues with Valgrind? A lot of beginners try to value init: A quick search for the "Most Vexing Parse" will provide a better explanation than I can. Instead of, You may not initialize an array with empty braces. Declaration and Initializing Structure. In (ANSI) C99, you can use a designated initializer to initialize a structure: Other members are initialized as zero: "Omitted field members are implicitly initialized the same as objects that have static storage duration." See e.g. You wouldn't normally memset a class after creating it, since its constructor (presumably) did the initialization. The general syntax to create a structure is as shown below: How to initialize HashSet values by construction? The choice depends on user preference or the one which your coding standard mandates. C# program to demonstrate the example of the left-shift operator. We can use the following initialization method to initialize struct: Initialization at Declaration Initialization using Designated Initializer Initialized at compile time using the dot (.) Use Assignment List Notation to Initialize a Struct in C Alternatively, there might be a scenario when a declared struct is not immediately initialized and needs to be assigned later in the program. Generally, the initialization of the structure variable is done after the structure declaration. 21 If there are fewer initializers in a brace-enclosed list than thereare elements or members of an aggregate, or fewer characters in astring literal used to initialize an array of known size than thereare elements in the array, the remainder of the aggregateshall be initialized implicitly the same as objects that have staticstorage duration. Using, This is absolutely wrong. A Structure is a helpful tool to handle a group of logically related data items. So the compiler has a hard time parsing this and telling the difference between variable declaration and forward declaration of a function. C# program to calculate the size of the area in square-feet based on specified length and width. Here is the section of the gcc manual which explains the syntax of designated initializers for both structs and arrays: In a structure initializer, specify the name of a field to initialize with '.fieldname =' before the element value. A non POD struct may as well have a constructor so it can initialize members. Easiest way to convert int to string in C++. Not the answer you're looking for? I am a beginner programmer in C. Designed by Colorlib. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Ready to optimize your JavaScript with Rust? Whether it's a struct or a class has nothing to do with the ability to memset or create a constructor. So given: struct { char x; int y; char z; int w; } S = {0}; you can be sure that x, y, z, and w of S will all be zero-initialized. Find centralized, trusted content and collaborate around the technologies you use most. Example: // Declare structure variable struct student stu1; // Initialize structure members stu1.name = "Pankaj"; stu1.roll = 12; stu1.marks = 79.5f; Value initialized structure variable There is good information about structs in c++ - https://www.geeksforgeeks.org/structures-in-cpp/. How to initialize const members of structs on the heap, C and C++ : Partial initialization of automatic structure, Using Contiguous Memory of C Struct Members, Dynamic Memory allocation of array inside structure in C. Add a new light switch in line with another switch? How Is It Different from Undefined Behavior, Efficient Way to Determine Number of Digits in an Integer, C++ Warning: Deprecated Conversion from String Constant to 'Char*' [-Wwrite-Strings], About Us | Contact Us | Privacy Policy | Free Tutorials. The ISO c and ISO c++ standard say that setting all bits zero does not guarantee the floating point value to be zero. (https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html), I think there is a typo in the declaration of the data member arr. Also, I wrote, I agree (but we both also know, that most non-trivial C programs will use pointers eventually). How is the merkle root verified if the mempools may be different? Central limit theorem replacing radical n with n, Negative numbers less than -(2-2e-23) 2e127 (negative overflow), Negative numbers greater than -2e-149 (negative underflow), Positive numbers less than 2e-149 (positive underflow), Positive numbers greater than (2-2e-23) 2e127 (positive overflow). In this case I'm not using a class, but a struct. Products, processes, services and even people can be certified. Does integrating PDOS give total charge of a system? It is possible to create structure pointers. The new syntax with () should value-initialize the object, assuming it is POD. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? BTW, it seems that this feature is not available in C++ , Security of Medical Devices A Changing Regulatory, Over the past two decades, medical devices have been increasingly likely to be connected to the outside world using Wi-Fi,, Safety Certification of Software Modules What and Why is, Standards apply to products, services, and everything in between. The example . An initializer for a structure is a brace-enclosed comma-separated list of values, and for a union, a brace-enclosed single value. Structures in C++ How to create a structure? @mmutz and @Erik - agreed - shortened my answer to prevent confusion. We both know, that it is impossible to cover whole topic in every answer to a simple problem. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. What is the significance of 0.0f when initializing (in C)? I am trying to initialize this struct to a value of 0.0 during initialization and also during run time for an Embedded application. 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