How to make a simple calculator in Java.

Question

Can someone help me make a simple calculator in Java.

Answer 1

Java is a very high programming language. Because of the diversity java has, it's possible to build almost anything. Let’s make a simple calculator using java. 

• - Using the Scanner class, take two numbers 

• - Switch case branching is used to execute the section 

• - To compare the corresponding operations, use a switch case 

• To test the respective operations using a switch event 

• // Java program for simple calculator  

  import java.io.*; // importing necessary libraries 

  import java.lang.*;  // importing necessary libraries 

  import java.lang.Math;  

  import java.util.Scanner;  

  public class BasicCalculator {  

  public static void main(String[] args)  

  {  

  // stores two numbers  

  double number1, number2;  

  // Taking input from the user  

  Scanner sc = new Scanner(System.in);  

  System.out.println("Please enter the numbers");  

  // take the inputs  

  number1 = sc.nextDouble();  

  number2 = sc.nextDouble();  

  System.out.println("Please 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");  

  break;  

  }  

  System.out.println("The final result:");  

  System.out.println();  

  // print the final result  

  System.out.println(num1 + " " + op + " " + num2+ " = " + o);  

  }  

  }