Swap.java

Below is the syntax highlighted version of Swap.java from §1.2 Built-in Types of Data.

/******************************************************************************
 *  Compilation:  javac Swap.java
 *  Execution:    java Swap a b
 *
 *  Read in two integer command-line arguments a and b and
 *  swap their values using the swapping idiom described on p. 17.
 *  After each assignment statement, use System.out.println() to
 *  print out a trace of the variables.
 *
 *  %  java Swap 11 99
 *  a = 11, b = 99, c = 0
 *  a = 11, b = 99, c = 11
 *  a = 99, b = 99, c = 11
 *  a = 99, b = 11, c = 11
 *
 ******************************************************************************/

public class Swap {
    public static void main(String[] args) {
        int a = Integer.parseInt(args[0]);
        int b = Integer.parseInt(args[1]);
        int c = 0;

        System.out.println("a = " + a + ", b = " + b + ", c = " + c);
        c = a;
        System.out.println("a = " + a + ", b = " + b + ", c = " + c);
        a = b;
        System.out.println("a = " + a + ", b = " + b + ", c = " + c);
        b = c;
        System.out.println("a = " + a + ", b = " + b + ", c = " + c);
    }

}