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

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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);