Home/ Questions/How to fix “warning: control reaches end of non-void function c++”
Next
Answered
Léna Bigot
  • 11
Asked: 2022-05-17T13:15:20+00:00 In:

How to fix “warning: control reaches end of non-void function c++”

  • 11

. Advertisement .

..3..

. Advertisement .

..4..

The error “control reaches end of non-void function” occurred when I run the C codes. I’ve tried to fix it for some days but have not resolved it yet. Can someone suggest a relevant solution to fix the warning: control reaches end of non-void function c++ issue? Much appreciate your support.

int main(void) {}
non-void function c++
Share

3 Answers

  1. Best Answer

    As indicated in, the return-type for int is used in the main function. 

    int main(void)

    However, your main function doesn’t return any information. It closes after 

    puts(strB);

    Add 

    return 0;

    It will all work after that.

    • 23

  2. You can also use a C99 compiler instead of the obvious return statement being added to main().

    C99 allows main() to not have a return declaration, and the } implicitly returns 0. 

    $ gcc -c -Wall t.c
t.c: In function ‘main’:
t.c:20: warning: control reaches end of non-void function
$ gcc -c -Wall -std=c99 t.c
$

    Purists will consider this important: not correct the warning by declaring main() as returning type void.

    • 10

  3. This warning is identical to that described under Return with no value. GCC assumes that control has reached the end of a function without encountering a return value. This is because the function must return a value. Add a return statement at the end of each function that returns a suitable value even if control is never reached.

    int main(void)
{
  // do something  
  return 0;
}
    • 0

Leave an answer

You must login to add an answer.

Need An Account,