#!/bin/sh
read a; read b;
echo "a+b = " `expr $a + $b`
echo "a-b = " `expr $a - $b`
echo "a*b = " `expr $a \* $b`
echo "a/b = " `expr $a / $b` # truncates towards 0
echo "a mod b = " `expr $a % $b` # same sign as first operand