{{keywords>wiki library source code example reference}}
===== modf =====
<code c>
    double modf(double , double *int);
</code>
Splits completely paid off and returns the fractional part of x.

===== C Sourcecode Example =====
compile in linux with: gcc modf.c -o modf **-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 i, result;
  result=modf(4.2, &i);
  printf ("%lf + %lf = %lf \n", i, result, 4.2 );
  return 0;
}
</code>

==== output ====
    output: ./modf 
    4.000000 + 0.200000 = 4.200000