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LETTERfmodULETTER Calculates the modulus for floating-point divisions.

Overview
#include <math.h>

x = fmod(y, z);

double x, y, z;

Portability
ANSI

Description
This function calculates the floating-point remainder for y/z (similar to x = y % z, if the % modulus operator were defined for floating-point operators). Don't mix up this function with modf.

Returns
"fmod" returns the value of "y", if "z" does not equal "z". Otherwise a value smaller than "z" and with the same sign as "y" is returned.

See also
modf

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

void main(void)
{
double r;

r = fmod(5.2, 1.5); // r contains 1.2
printf("fmod(5.7, 1.5) = %lf\n", r);
}