Exercises Java with Examples-
Practice Exercises Java 4,5 5 302940

Calculator - if - Practice Exercises Java

Lesson 3:

Basic data types

Exercise 3.5:

Calculator - if


Write a program which asks the user for two numbers and an operation to perform on them (+,-,*,x,/) and displays the result of that operation, as in this example:

Enter first number: 5
Enter operation: +
Enter second number: 7

Note: you MUST use "if", not "switch"

Source Code:

import java.util.*;
public class Main
	public static void main(String[] args)
		int a, b;
		char operation;

		System.out.print("Enter first number: ");
		a = Integer.parseInt(new Scanner(System.in).nextLine());

		System.out.print("Enter operation: ");
		operation = (char)new Scanner(System.in).nextLine();

		System.out.print("Enter second number: ");
		b = Integer.parseInt(new Scanner(System.in).nextLine());

		if (operation == '+')
			System.out.printf("%1$s + %2$s = %3$s" + "\r\n", a, b, a + b);
		else if (operation == '-')
			System.out.printf("%1$s - %2$s = %3$s" + "\r\n", a, b, a - b);
		else if ((operation == 'x') || (operation == '*'))
			System.out.printf("%1$s * %2$s = %3$s" + "\r\n", a, b, a * b);
		else if (operation == '/')
			System.out.printf("%1$s / %2$s = %3$s" + "\r\n", a, b, a / b);
			System.out.println("Wrong Character");
Exercisey 3.5

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