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Synopsis:
    #include <math.h>
    double modf( double value, double *iptr );

Description:
    The modf function breaks the argument value into integral and fractional
    parts, each of which has the same sign as the argument.  It stores the
    integral part as a double in the object pointed to by iptr.

Returns:
    The modf function returns the signed fractional part of value.

See Also:
    frexp, ldexp

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

    void main()
      {
        double integral_value, fractional_part;

        fractional_part = modf( 4.5, &integral_value );
        printf( "%f %f\n", fractional_part, integral_value );
        fractional_part = modf( -4.5, &integral_value );
        printf( "%f %f\n", fractional_part, integral_value );
      }

    produces the following:

    0.500000 4.000000
    -0.500000 -4.000000

Classification:
    ANSI

Systems:
    All