Modulus Operator

#include <stdio.h>

main()

{

int a, b, q, r;

printf(" a b a/b a%%b\n");

while (scanf("%d%d", &a, &b) != EOF) {

q = a / b; /* quotient */

r = a % b; /* remainder */

printf("%4d %5d %5d %5d\n",

a, b, q, r);

}

}

This is the program mod.c.

a.out < in.dat

a b a/b a%b

10 3 3 1

3 10 0 3

-10 3 -3 -1

10 -3 -3 1

-10 -3 3 -1

(in.dat contains a list of the first two columns of numbers a and b)

It is always true that

a = q*b + r

with |r|<|b|, b? 0.

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