libc.info: div

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`div'--divide two integers

*Synopsis*
     #include <stdlib.h>
     div_t div(int N, int D);
   *Description*
Divide N/D, returning quotient and remainder as two integers in a
structure `div_t'.
*Returns*
The result is represented with the structure

typedef struct
{
int quot;
int rem;
} div_t;

   where the `quot' field represents the quotient, and `rem' the
remainder.  For nonzero D, if ``R = div(N,D);'' then N equals ``R.rem +
D*R.quot''.
   To divide `long' rather than `int' values, use the similar function
`ldiv'.
*Portability*
`div' is ANSI.
   No supporting OS subroutines are required.