Question

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Divide and Get Remainder at the same time?

Is it possible to get both the quotient and the remainder of integer division in a single step, i.e., without performing integer division twice?

Answer 1

div will do this. See reference and example:

/* div example */
#include <stdio.h>
#include <stdlib.h>

int main ()
{
  div_t divresult;
  divresult = div (38,5);
  printf ("38 div 5 => %d, remainder %d.\n", divresult.quot, divresult.rem);
  return 0;
}

Output:

38 div 5 => 7, remainder 3.

EDIT:

The C Specification says:

7.20 General utilities

The types declared are size_t and wchar_t (both described in 7.17),
div_t
which is a structure type that is the type of the value returned by the div function,
ldiv_t
which is a structure type that is the type of the value returned by the ldiv function, and
lldiv_t
which is a structure type that is the type of the value returned by the lldiv function.

… but it doesn’t say what the definition of div_t is.