pointer/integer type mismatch in conditional expression

Question

gcc 4.7.2 c89

Hello,

I am getting the following warning:

pointer/integer type mismatch in conditional expression
         


        

Answer 1

Check whether you have included header. If not, the return value of strerror may be considered as an integer value. It would explain why the program runs ok (the linker can find a matched function named strerror, because the C standard library is linked by default), whereas the compiler reports a warning.