Question

Goals Practice conditional statements Description Write a program to simulate a menu driven calculator that performs basic arithmetic operations (add, subtract, multiply and divide). The calculator accepts two numbers and an operator from user in a given format: For example: Input: 6.3 / 3 Output: 2.1 Create a Calculator class that has a method to choose the right mathematical operation based on the entered operator using switch case. It should then call a corresponding method to perform the operation. In the main method of the testing class create an object of Calculator and accept user’s input using Scanner object, In java .

Answer 1

input code:

output:

code:

import java.util.*;
/*make a class */
class Calculator
{
/*declre the data memberss*/
double num1,num2;
/*parameterise constructor*/
Calculator(double n1,double n2)
{
num1=n1;
num2=n2;
}
/*Addition the numbers*/
double Addition()
{
return num1+num2;
}
/*substraction the number*/
double Substraction()
{
return num1-num2;
}
/*Multipication the numbers*/
double Multipication()
{
return num1*num2;
}
/*divide the numbers*/
double divide()
{
return num1/num2;
}
}
public class Main
{
   public static void main(String[] args)
   {
   /*make object of Scanner*/
   Scanner sc=new Scanner(System.in);
       System.out.print("Addition(+)\nSubstraction(-)\nMultipication(*)\nDivide(/)\nEnter the input: ");
       /*take user input*/
       double a=sc.nextDouble();
       char op=sc.next().charAt(0);
       double b=sc.nextDouble();
       /*make object of Calculator class*/
       Calculator c=new Calculator(a,b);
       /*make switch*/
       switch(op)
       {
       case '+': /*call Addition function*/
       System.out.print(a+" + "+b+" = "+c.Addition());
       break;
       case '-': /*call Substraction function*/
       System.out.print(a+" - "+b+" = "+c.Substraction());
       break;
       case '*': /*call Multipication function*/
       System.out.print(a+" * "+b+" = "+c.Multipication());
       break;
       case '/': /*call divide function*/
       System.out.print(a+" / "+b+" = "+c.divide());
       break;
       }
   }
}