How to initialize a struct in accordance with C programming language standards

Question

How to initialize a struct in accordance with C programming language standards

I need to instate a struct element, split in presentation and introduction. This is the thing that I have:

typedef struct MY_TYPE {

  bool flag;

  short int value;

  double stuff;

} MY_TYPE;



void function(void) {

  MY_TYPE a;

  ...

  a = { true, 15, 0.123 }

}

Is this the best approach to announce and instate a local variable of MY_TYPE as per C programming language norms (C89, C90, C99, C11, and so forth)? Or then again is there anything better or possibly working?

initialization struct

4 years ago by Bharatgxwzm

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**rahul07** · Answer 1 · 2021-05-15T13:40:04

In (ANSI) C99, you can use a designated initializer to initialize a structure:



MY_TYPE a = { .flag = true, .value = 123, .stuff = 0.456 };

Other members are initialized as zero: "Omitted field members are implicitly initialized the same as objects that have static storage duration."

**RoliMishra** · Answer 2 · 2021-05-18T14:21:42

You can do it with a compound literal. According to that page, it works in C99 (which also counts as ANSI C).

MY_TYPE a;



a = (MY_TYPE) { .flag = true, .value = 123, .stuff = 0.456 };

...

a = (MY_TYPE) { .value = 234, .stuff = 1.234, .flag = false };

The designations in the initializers are optional; you could also write:

a = (MY_TYPE) { true,  123, 0.456 };

...

a = (MY_TYPE) { false, 234, 1.234 };

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How to initialize a struct in accordance with C programming language standards

2 Answers

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