{{keywords>wiki library source code example reference}}
===== fmod =====
<code c>
    double fmod(double, double );
</code>
returns the remainder of a statement

===== C Sourcecode Example =====
compile in linux with: gcc fmod.c -o fmod **-lm** -Wall
<code c>     
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

#include <math.h> /* including math library */

int main ( void ) 
{
double y,x;
x = 9;
y = 4.2;
printf("rest of %f / %f is %f\n", x, y, fmod(x,y) );
return 0;
}

</code>

==== output ====
   output:
   user@host:~$ ./fmod 
   rest of 9.000000 / 4.200000 is 0.600000