modf

Splits a floating-point value into fractional and integer parts.

doublemodf(doublex**,double*intptr);**

For additional compatibility information, see Compatibility in the Introduction.

Libraries

Return Value

This function returns the signed fractional portion of x. There is no error return.

Parameters

x

Floating-point value

intptr

Pointer to stored integer portion

Remarks

The modf function breaks down the floating-point value x into fractional and integer parts, each of which has the same sign as x. The signed fractional portion of x is returned. The integer portion is stored as a floating-point value at intptr.

Example

/* MODF.C */

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

void main( void )
{
   double x, y, n;

   x = -14.87654321;      /* Divide x into its fractional */
   y = modf( x, &n );     /* and integer parts            */

   printf( "For %f, the fraction is %f and the integer is %.f\n",
           x, y, n );
}

Output

For -14.876543, the fraction is -0.876543 and the integer is -14

Floating-Point Support Routines, Long Double

See Also   frexp, ldexp