struct.field返回另一个值，为什么？

Question

My goal is to create an fisrt of my custom struct type. When run, prints out 24. Can't understand why:

#include <stdio.h>
typedef struct strktura {
    int number;
    char name;
} strktura;

strktura new_one(int number, char name){
    strktura a;
    a.number=number;
    a.name=name;
}

main()
{
        strktura first=new_one(2,"A");
        printf("%d\n",first.number);
}

Answer 1

You forgot to return from new_one() .

Related Reading: From chapter 6.9.1, paragraph 12, C11 document,

If the } that terminates a function is reached, and the value of the function call is used by the caller, the behavior is undefined.

So, in your code, without a return from new_one() and by accessing the return value through printf("%d\\n",first.number); , you're facing undefined behaviour .

Also, worthy to mention, the correct syntax for main() is int main() , (and a matching return 0 is a good practice.)

Answer 2

You need to add a

return a;

in your new_one() function so that the structure gets returned from the function new_one()