sqrt() pow() fabs() do not work

i am trying to compile my program where i am using the functions like sqrt pow and fab开发者_开发问答s. I do have math.h included but for some reason i get errors like:

    error C2668: 'fabs' : ambiguous call to overloaded function

same for the rest of the functions i have this included:

    #include "stdafx.h"
    #include "math.h"

i tried including but still same errors. Does anyone know why they are not being recognized? my file is .cpp not .c but it is an MFC project.

thanks

It's because those functions are overloaded for several types: float, double and long double. Thus, if you pass in an integer, the compiler doesn't which one to choose. An easy fix is to simply pass a double (or multiply what you pass in by 1.0), this should fix the problem.

      int value = rand();
      int result1 = (int)fabs(value*1.0); 
      printf("%d, %d\n", result1, result1);

otherwise:

     int value = rand();
     int result1 = (int)fabs((double)value); 
     printf("%d, %d\n", result1, result1);