Java Examples: Generating a random math operator in Java

Question:

How do I go about generating a random math operator in Java?

Answer:

By using a random number generator and a switch statement:

Code:

import java.util.Random;
 
public class SimpleMath {
 
   public static void main(String[] args) {
 
      Random r = new Random();
 
      int A = 10;
      int B = 2;
      char operator ='?';
      int value = 0;
 
      switch (r.nextInt(4)){
        case 0: operator = '+';
                value = A+B;
                break;
        case 1: operator = '-';
                value = A-B;;
                break;
        case 2: operator = '*';
                value = A*B;;
                break;
        case 3: operator = '/';
                value = A/B;;
                break;
        default: operator = '?';
      }
 
      System.out.print(A);
      System.out.print(" ");
      System.out.print(operator);
      System.out.print(" ");
      System.out.print(B);
      System.out.print(" = ");
      System.out.println(value);
   }
}

Output:

$ java SimpleMath
10 * 2 = 20

$ java SimpleMath
10 - 2 = 8

$ java SimpleMath
10 + 2 = 12

$ java SimpleMath
10 * 2 = 20