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modf, modfl

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

Copy Code

    #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 |  | + | + | +

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