package Chapter8;

public class Calculator {
 /** Main method */
 public static void main(String[] args) {
 // Check command-line arguments
 if (args.length != 3) {
 System.out.println(
 "Usage: java Calculator operand1 operator operand2");
 System.exit(0);
 }

 // The result of the operation
 int result = 0;

 // Determine the operator
 switch (args[1].charAt(0)) {
 case '+': result = Integer.parseInt(args[0]) +
 Integer.parseInt(args[2]);
 break;
 case '-': result = Integer.parseInt(args[0]) -
 Integer.parseInt(args[2]);
 break;
 case '*': result = Integer.parseInt(args[0]) *
 Integer.parseInt(args[2]);
 break;
 case '/': result = Integer.parseInt(args[0]) / 
 		 Integer.parseInt(args[2]);
 }
 
 // Display result
 System.out.println(args[0] + ' ' + args[1] + ' ' + args[2]
 + " = " + result);
 }
}