Question

Unit 4: Discussion - Part 1

Question

Read the lecture for Chapter 4, and then answer the following:

Think of a brief example where you can use conditional statements and write it in correct Java syntax. You may use if-else-if statements or the switch statement. You may also use the example you wrote in pseudo code for the discussion thread 2 during week 2 and convert it to Java, if you think it is appropriate. Be mindful that we are not talking about homework here. Do not post homework in this or any other discussion thread. As always, show a screen capture of the program running.
After writing your example, please explain if you think your example could also be written in the other conditional statement you did not chose. Explain why you think so, or why not.

Answer 1

If you have any problem with the code feel free to comment

Program

import java.util.Scanner;

public class Test {
   public static void main(String[] args) {
       //basic calculator app
      
       Scanner sc = new Scanner(System.in);
       int num1, num2, choice;
      
       System.out.print("Enter the first number: ");
       num1 = sc.nextInt();
       System.out.print("Enter the second number: ");
       num2 = sc.nextInt();
      
       System.out.println("1. Add\n2. Subtract\n3. Multiply\n4. Divide");
       System.out.print("Enter your choice: ");
       choice = sc.nextInt();
      
       switchOperation(num1, num2, choice);
       ifelseOperation(num1, num2, choice);
      
       sc.close();
   }
  
   /*Switch case is more preferred as depending upon the choice the calculation is performed
   *and it will be faster than if/else staetemnet in this case
   *It also improves the clarity and readability of the program*/
   private static void switchOperation(int num1, int num2, int choice) {
       System.out.println("********The Switch Statement********");
       switch(choice) {
       case 1:
           System.out.println("The sum is "+(num1+num2));
           break;
       case 2:
           System.out.println("The difference is "+(num1-num2));
           break;
       case 3:
           System.out.println("The multiplication result is "+(num1*num2));
           break;
       case 4:
           System.out.println("The division result is "+(num1/num2));
           break;
       default:
           System.out.println("Invalid choice!");
           break;
       }  
   }
  
   /*The calculation can also be represented in if/else statement but
   * if else is used for checking boolean expressions which makes it slower here */
   private static void ifelseOperation(int num1, int num2, int choice) {
       System.out.println("********If Else Statement********");
       if(choice == 1)
           System.out.println("The sum is "+(num1+num2));
       else if(choice == 2)
           System.out.println("The difference is "+(num1-num2));
       else if(choice == 3)
           System.out.println("The multiplication result is "+(num1*num2));
       else if(choice == 4)
           System.out.println("The division result is "+(num1/num2));
       else
           System.out.println("Invalid choice!");      
   }
}

Output