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Floating Point Issues - Programming

Q1:

Which of the following statement obtains the remainder on dividing 5.5 by 1.3 ?

A rem = (5.5 % 1.3)

B rem = modf(5.5, 1.3)

C rem = fmod(5.5, 1.3)

D rem = fmod(5.5, 1.3)

ANS:C - rem = fmod(5.5, 1.3)

fmod(x,y) - Calculates x modulo y, the remainder of x/y.
This function is the same as the modulus operator. But fmod() performs floating point divisions. Example: 

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

int main ()
{
  printf ("fmod of 5.5 by 1.3 is %lf\n", fmod (5.5, 1.3) );
  return 0;
}
Output:
fmod of 5.5 by 1.3 is 0.300000