function which takes no parameters Vs function which takes parameter

Question

I was educated from here that

void f();
void f(int a) {
    printf("%d", a);
}

the parameter type list "wins". I did the following...

int fun(void); //parameter type list
int fun(int a, double b)//parameter type list
{
    printf("%d, %f", a, b);
    return 0;
}

I was expecting that compiler will throw an error (since overloading is not possible in c), but it didn't

Can anyone help me in this regards?

Thanks.

what compiler are you using. It should definitely throw an error.. `error: conflicting types for ‘fun’` — Haris, Aug 03 '15 at 17:58
Yes you are correct, it is throwing an error. I checked in gcc. But why VS is not doing so? — Rachana Pal, Aug 03 '15 at 18:01
@RachanaPal Are you sure that you're compiling with a VS C compiler, rather than C++? — Jashaszun, Aug 03 '15 at 18:12
@Jashaszun AFAIR it's the same compiler, distinguishing only by file name (extension). And visual studio doesn't provide an easy way (aka wizard) to create a `.c` file. — , Aug 03 '15 at 18:34
@FelixPalmen Yeah it does... you can create a new file -> select "New C++ File", and then in the file name box enter something that ends with ".c". Now you have a C file that it compiles with the C compiler. — Jashaszun, Aug 03 '15 at 18:35
@RachanaPal ... "wins" is wrong: the declaration `void f();` just doesn't say anything about the parameters, that's perfectly valid but *bad practice* — , Aug 03 '15 at 18:36
@Jashaszun sure, that's what I do when I need it. But notice the "New **C++** File" ... it's like MS is trying to keep VS users from coding in [tag:c]. — , Aug 03 '15 at 18:37
@FelixPalmen Ah sorry, I thought that you actually didn't know how to do it. Yeah, I agree, it is weird that they don't have a "New C File" option. — Jashaszun, Aug 03 '15 at 18:38

score 0 · Answer 1 · answered Aug 03 '15 at 18:41

Since you're using Visual Studio, the most likely reason for your situation is that your code is in a C++ file. Note that VS distinguishes between C and C++ files based on the file extension. Changing your file to a .c file rather than a .cpp file should do the trick.

(Note that when you Add New Item to create a source file, you can create a C file simply by adding a new C++ file and then changing the name of the created file to be .c, as in the image below.)

function which takes no parameters Vs function which takes parameter

1 Answers1