Split a floating-point value into fractional and integer parts.
#include <math.h>
double modf( double x, double *intptr );
long double _modfl( long double x, long double *intptr );
| x | Floating-point value | |
| intptr | Pointer to stored integer portion |
The modf functions break 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.
The _modfl function uses the 80-bit, 10-byte coprocessor form of arguments and return values. See the reference page on the long double functions for more details on this data type.
The modf and _modfl functions return the signed fractional portion of x. There is no error return.
modf
Standards:ANSI, UNIX
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:DOS32X
_modfl
Standards:None
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:None
/* 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 );
}
For -14.876543, the fraction is -0.876543 and the integer is -14