Taking Input in Java Programming

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Taking Input From User In Java Programs

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Hello, I am Aditya Chauhan...

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Here's a Java program to create a calculator. This is a menu driven program. It takes input of two integers and show the calculations as the option chosen.

//Program Starts Here

import java.io.*;

class calc

{

public static void main(String arg[]) throws IOException

{

int a,b,opt;

InputStreamReader isr=new InputStreamReader(System.in);

BufferedReader br=new BufferedReader(isr);

do

{

System.out.println(" Main Menu");

System.out.println(" 1.Add Two Numbers");

System.out.println(" 2.Subtract Two Numbers");

System.out.println(" 3.Multiply Two Numbers");

System.out.println(" 4.Divide Two Numbers");

System.out.println(" 5.Exit");

opt=Integer.parseInt(br.readLine());

switch(opt)

{

case 1:

System.out.println("Enter the first number: ");

a=Integer.parseInt(br.readLine());

System.out.println("Enter the second number: ");

b=Integer.parseInt(br.readLine());

System.out.println("Answer:  "+a+" + "+b+" = "+(a+b));

break;

case 2:

System.out.println("Enter the first number: ");

a=Integer.parseInt(br.readLine());

System.out.println("Enter the second number: ");

b=Integer.parseInt(br.readLine());

System.out.println("Answer:  "+a+" - "+b+" = "+(a-b));

break;

case 3:

System.out.println("Enter the first number: ");

a=Integer.parseInt(br.readLine());

System.out.println("Enter the second number: ");

b=Integer.parseInt(br.readLine());

System.out.println("Answer:  "+a+" * "+b+" = "+(a*b));

break;

case 4:

System.out.println("Enter the first number: ");

a=Integer.parseInt(br.readLine());

System.out.println("Enter the second number: ");

b=Integer.parseInt(br.readLine());

System.out.println("Answer:  "+a+" / "+b+" = "+(a/b));

break;

case 5:

break;

default:

System.out.println("Invalid Option!");

}

}while(opt!=5);

}

}

//Program Ends Here

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