modf, modfl

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Header File

math.h

Category

Math Routines

Prototype

double modf(double x, double *ipart);

long double modfl(long double x, long double *ipart);

Description

Splits a double or long double into integer and fractional parts.

modf breaks the double x into two parts: the integer and the fraction. modf stores the integer in ipart and returns the fraction.

modfl is the long double version; it takes long double arguments and returns a long double result.

Return Value

modf and modfl return the fractional part of x.

Example

#include <math.h>
#include <stdio.h>
int main(void)
{
    double fraction, integer;
    double number = 100000.567;
    fraction = modf(number, &integer);
    printf("The whole and fractional parts of %lf are %lf and %lf\n",
           number, integer, fraction);
    return 0;
}
 

Portability

	POSIX	Win32	ANSI C	ANSI C++
modf	+	+	+	+
modfl		+	+	+