Returning a struct and passing a struct to functions

Question

I am trying to return a struct which is defined as below:

EXAMPLE.C
struct test
{
    int x;
    int y;
    int z;
};
struct test t1,t2;

I don't even have to explain the function, because I am getting error while declaring the function in the header file.

EXAMPLE.H
test calculate(int percent,int distance);
int modify(struct test x1);

So I will return the struct t1 in the function calculate and i will pass the struct t2 into the function modify. I am not sure what am I doing wrong, but I am getting syntax error

Did you even READ the error? I really takes less time than posting a question. So compilers also show messages like Did you mean .... — Ajay Brahmakshatriya
– Ajay Brahmakshatriya, Commented Oct 24, 2018 at 5:23

AnT stands with Russia · Accepted Answer · 2018-10-24 05:25:13Z

4

Firstly, your struct type is called struct test. Not just test, but struct test. Two words. You used the proper type name in your modify function. You used the proper type name in the declaration of t1 and t2. Why did you suddenly shorten it to a mere test in case of calculate?

Secondly, it appears that you are trying to use a yet-undeclared struct type in your function declarations, since the functions are declared in .h file and struct type is declared in .c file. Something like this can be done properly, but this is generally not a good idea (unless you are trying to implement an opaque type). And most likely this is not what you are trying to do. So, why are you declaring your struct type in .c file? A better idea would be to declare it in .h file as well, above your functions.

answered Oct 24, 2018 at 5:25

AnT stands with Russia

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2 Comments

David C. Rankin Over a year ago

It may be worth mentioning that care should be taken in understanding the difference between a function declaration and the function definition. (it may not be so obviously apparent to new C programmers)

user5603723 Over a year ago

I know the difference between declaration & definition. it was the declaration in the .h file. But I was in wrong assumption that I can declare the struct in .c file. I was wrong. and also missing "struct". Thank you!

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