In this Java program, you’ll learn how to make a simple calculator using a switch..case statement. This calculator would be able to perform these operations such as add, subtract, multiply and divide two numbers. In this program, we used the following Java basics such as switch..case statement.
Here is the code of the program to make a simple calculator using a switch..case statement.
//Java Program to Make a Simple Calculator Using switch case Statement
import java.util.Scanner;
public class JavaPrograms {
public static void main(String[] args) {
char operator;
Double number1, number2, result;
// create an object of Scanner class
Scanner sc = new Scanner(System.in);
// ask users to enter operator
System.out.println("Choose an operator: +, -, *, or /");
operator = sc.next().charAt(0);
// ask users to enter numbers
System.out.println("Enter first number");
number1 = sc.nextDouble();
System.out.println("Enter second number");
number2 = sc.nextDouble();
switch (operator) {
// performs addition between numbers
case '+':
result = number1 + number2;
System.out.println(number1 + " + " + number2 + " = " + result);
break;
// performs subtraction between numbers
case '-':
result = number1 - number2;
System.out.println(number1 + " - " + number2 + " = " + result);
break;
// performs multiplication between numbers
case '*':
result = number1 * number2;
System.out.println(number1 + " * " + number2 + " = " + result);
break;
// performs division between numbers
case '/':
result = number1 / number2;
System.out.println(number1 + " / " + number2 + " = " + result);
break;
default:
System.out.println("Invalid operator!");
break;
}
sc.close();
}
}
Choose an operator: +, -, *, or /
+
Enter first number
52
Enter second number
52
52.0 + 52.0 = 104.0
Choose an operator: +, -, *, or /
-
Enter first number
100
Enter second number
40
100.0 - 40.0 = 60.0
Choose an operator: +, -, *, or /
/
Enter first number
100
Enter second number
5
100.0 / 5.0 = 20.0
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