Function in C not returning anything when it's supposed to return int

Question

Possible Duplicate:
Function returns value without return statement

what is the return value of the function that returns int, but isn't returning anything explicitly.

For instance output of

    int fun()
    {
            printf("\ncrap");
    }


    void main()
    {
            printf("\n return value of fun %d", fun());
    }

The output I am getting is :

  crap
  return value of fun 1

Does this depend on compiler I am using ?

Thanks !!!

The answer is whatever's in the eax register, I had to add __asm { mov eax, eax; } at the end of the function in order to get it to compile on VC++2010. To get a value of 1 is strange as I would have thought it would have been the return value from the printf("\ncrap") call, which would have been 5. — James, May 31 '12 at 01:24

score 2 · Answer 1 · answered May 31 '12 at 01:14

2

You don't have a return value in fun() function, so the value returned is undefined.

answered May 31 '12 at 01:14

nhahtdh

score 1 · Answer 2 · edited May 23 '17 at 11:56

1

It might be returning whatever's in the EAX register, which is probably unreliable without an explicit return value:

edited May 23 '17 at 11:56

Community

answered May 31 '12 at 01:16

Nick

waitingkuo · Answer 3 · 2012-05-31T02:06:47.763

-1

It depends on compiler. That's my output, for your information

compiler: i686-apple-darwin11-llvm-gcc-4.2

crap
return value of fun 0

edited May 31 '12 at 02:06

answered May 31 '12 at 01:20

waitingkuo

3 Answers3