div() is a Utility Function that returns the quotient and remainder in the "div_t" type for integers. For long integers the quotient and remainder is returned using the "ldiv_t" type defined by the header file.

   div_t div(int numerator, int denominator);
   ldiv_t div(long numerator, long denominator);    

   #include <stdlib.h>
   #include <stdio.h>
   int main ()
     {
       div_t  r;
       r=div(13,2);
       printf ("The quotient of 13/2 is: %d\n", r.quot);
       printf ("The remainder is:%d", r.rem);
       return 0;
     }

   The quotient of 13/2 is: 6
   The remainder is: 1

In the above example div() is used to perform integer division and find the quotient and the remainder of 13 is divided by 2.