bool.java

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//: c03:Bool.java
// Relational and logical operators.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import com.bruceeckel.simpletest.*;
import java.util.*;

public class Bool {
  static Test monitor = new Test();
  public static void main(String[] args) {
    Random rand = new Random();
    int i = rand.nextInt(100);
    int j = rand.nextInt(100);
    System.out.println("i = " + i);
    System.out.println("j = " + j);
    System.out.println("i > j is " + (i > j));
    System.out.println("i < j is " + (i < j));
    System.out.println("i >= j is " + (i >= j));
    System.out.println("i <= j is " + (i <= j));
    System.out.println("i == j is " + (i == j));
    System.out.println("i != j is " + (i != j));
    // Treating an int as a boolean is not legal Java:
//! System.out.println("i && j is " + (i && j));
//! System.out.println("i || j is " + (i || j));
//! System.out.println("!i is " + !i);
    System.out.println("(i < 10) && (j < 10) is "
       + ((i < 10) && (j < 10)) );
    System.out.println("(i < 10) || (j < 10) is "
       + ((i < 10) || (j < 10)) );
    monitor.expect(new String[] {
      "%% i = -?\\d+",
      "%% j = -?\\d+",
      "%% i > j is (true|false)",
      "%% i < j is (true|false)",
      "%% i >= j is (true|false)",
      "%% i <= j is (true|false)",
      "%% i == j is (true|false)",
      "%% i != j is (true|false)",
      "%% \\(i < 10\\) && \\(j < 10\\) is (true|false)",
      "%% \\(i < 10\\) \\|\\| \\(j < 10\\) is (true|false)"
    });
  }
} ///:~