Calcular resto float C++

[Eternal Idol]

Ejemplo extraido de la MSDN:

Código:

// crt_fmod.c
/* This program displays a floating-point remainder.
 */

#include <math.h>
#include <stdio.h>

int main( void )
{
   double w = -10.0, x = 3.0, z;

   z = fmod( w, x );
   printf( "The remainder of %.2f / %.2f is %f\n", w, x, z );
}