Create a simple calculator which can perform basic arithmetic operations like addition, subtraction, multiplication, or division depending upon the user input.
Example:
Enter the numbers: 2 2 Enter the operator (+,-,*,/) + The final result: 2.0 + 2.0 = 4.0
Approach
- Take two numbers using the Scanner class. The switch case branching is used to execute a particular section.
- Using a switch case to evaluate respective operations.
Below is the Java program to implement the calculator:
Java
// Java program for simple calculatorimport java.io.*;import java.lang.*;import java.lang.Math;import java.util.Scanner;// Driver classpublic class BasicCalculator { // main function public static void main(String[] args) { // Stores two numbers double num1, num2; // Take input from the user Scanner sc = new Scanner(System.in); System.out.println("Enter the numbers:"); // Take the inputs num1 = sc.nextDouble(); num2 = sc.nextDouble(); System.out.println("Enter the operator (+,-,*,/):"); char op = sc.next().charAt(0); double o = 0; switch (op) { // case to add two numbers case '+': o = num1 + num2; break; // case to subtract two numbers case '-': o = num1 - num2; break; // case to multiply two numbers case '*': o = num1 * num2; break; // case to divide two numbers case '/': o = num1 / num2; break; default: System.out.println("You enter wrong input"); } System.out.println("The final result:"); System.out.println(); // print the final result System.out.println(num1 + " " + op + " " + num2 + " = " + o); }} |
Output:
Enter the numbers: 2 2 Enter the operator (+,-,*,/) + The final result: 2.0 + 2.0 = 4.0
Time Complexity: O(1)
Auxiliary Space: O(1)
