#!/usr/bin/csh
#File's name: arithmetic.csh
#Author: Jen Chen
#Updated on: 08/12/04 
#Copyrighted by Jen Chen
#Caution:  Only integer arithmetic is allowed in C-shell scripting!!!

set USAGE="arithmetics.csh num num2; where num and num2 are integers."

#Check to see if the user passes the 2 integers from the command line.
  if($#argv < 2)then
     echo "$USAGE"
     exit 1
  endif

#Set the variables num and num2 to be the values passing from the 
#command line.

set num  = $argv[1] 
set num2  = $argv[2] 
  echo $num
  echo $num2

#In order to do mathematical computation in C-shell, we need to place the @
@sign at the beginning of each statemnent containing the operation.

@ sum = $num + $num2
   echo "$num + $num2 = " $sum
@ dif = $num - $num2
   echo "$num - $num2 = " $dif
@ prod = $num * $num2
@ div = $num / $num2
   echo "$num / $num2 = " $div
@ modu = $num % $num2  #compute modulo n
   echo "$num % $num2 = " $modu

#Now release the memories back to your OS.
   unset num num2 junk USAGE