Question

TO BE DONE IN JAvA

Complete the calculator program so that it prompts the user to enter two integers and an operation and then outputs the answer. Prompt the user three times, don't expect all the inputs on one line.

Possible operations are + - * /

No other words or symbols should be output, just the answer.

Requested files

import java.util.Scanner;

/**

* This is a simple calculator Java program.

* It can be used to calculate some simple calculation

* such as +, -, *, /. of two integers.

*/

public class Calculator {

     // the result of the math operation

     private int result;

     /**

      * This method is used to calculate a + b

      * @param a - an integer

      * @param b - an integer

      */

     public void add(int a, int b) { //a+b    

     }

     /**

      * This method is used to calculate a - b

      * @param a - an integer

      * @param b - an integer

      */

     public void subtract(int a, int b) { //a-b    

     }

     /**

      * This method is used to calculate a * b

      * @param a - an integer

      * @param b - an integer

      */

     public void multiply(int a, int b) { //a*b

   }

    

     /**

      * This method is used to calculate a/b

      * @param a - an integer

      * @param b - an integer

      */

     public void divide(int a, int b) {

     }

     /**

      * This method is used to return the intance variable result

      * @return The String result of the instance variable

      * Tips: Convert int to String

      */

     @Override   

     public String toString() {

         return "";

     }

    

     public static void main(String[] args){

        

         Calculator calc = new Calculator(); //use this instance to call the methods above to solve the problem

         }

}

Answer 1

Please look at my code and in case of indentation issues check the screenshots.

------------Calculator.java----------------

import java.util.Scanner;

/**
* This is a simple calculator Java program.
* It can be used to calculate some simple calculation
* such as +, -, *, /. of two integers.
*/
public class Calculator {
   // the result of the math operation
   private int result;
   /**
   * This method is used to calculate a + b
   * @param a - an integer
   * @param b - an integer
   */
   public void add(int a, int b) { //a+b
       result = a + b;            //store the sum in the result
   }

   /**
   * This method is used to calculate a - b
   * @param a - an integer
   * @param b - an integer
   */
   public void subtract(int a, int b) { //a-b
       result = a - b;            //store the difference in the result
   }

   /**
   * This method is used to calculate a * b
   * @param a - an integer
   * @param b - an integer
   */
   public void multiply(int a, int b) { //a*b
       result = a * b;            //store the product in the result
   }

   /**
   * This method is used to calculate a/b
   * @param a - an integer
   * @param b - an integer
   */
   public void divide(int a, int b) {
       result = a / b;            //store the division answer in the result
   }

   /**
   * This method is used to return the intance variable result
   * @return The String result of the instance variable
   * Tips: Convert int to String
   */
   @Override
   public String toString() {
       return Integer.toString(result);
   }

   public static void main(String[] args) {
       Calculator calc = new Calculator(); //use this instance to call the methods above to solve the problem
       Scanner sc = new Scanner(System.in);
      
       int a, b;
       System.out.print("Enter integer a: ");
       a = sc.nextInt();                           //read the two integers a, b
       System.out.print("Enter integer b: ");
       b = sc.nextInt();

       char operator;
       System.out.print("Enter operation: ");
       operator = sc.next().charAt(0);               //read the operation: + - * /
       if(operator == '+'){
           calc.add(a, b);                           //addition
       }
       else if(operator == '-'){
           calc.subtract(a, b);                   //subtraction
       }
       else if(operator == '*'){
           calc.multiply(a, b);                   //multiplication
       }
       else if(operator == '/'){
           calc.divide(a, b);                       //division
       }
       System.out.println(calc);   //print the result: This will automatically call the toString method, which prints the result
   }
}

--------------Screenshots-------------------

------------Output-----------------

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