SAS/C Library Reference, Vol. 1

fmod -- Floating-Point Conversion: Modulus

SYNOPSIS

 #include <math.h>

 double fmod(double y, double z);

DESCRIPTION

fmod determines the remainder when a real value y is divided by a real value z to produce an integer i. This function satisfies these relationships:

                       result x
 y = i * z + x,        |x| < |y|

This function performs the same operation for double arguments as the % operator does for int arguments.

RETURN VALUE

fmod returns the remainder of the division. If z is 0, the value returned is 0. Otherwise, the returned value has the same sign as y and is less than z.

EXAMPLE

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

  main()
  {
     float dollars;
     float leftovers;

     puts("Enter number of dollars");
     scanf("%f", &dollars);

     leftovers = fmod(dollars, .05);
     printf("$ %.2f contains at least ", dollars);
     printf(" %.2f in penniesn", leftovers);
  }

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