Java Program to Make a Simple Calculator Using switch...case

To understand this example, you should have the knowledge of the following Java programming topics:

Example: Simple Calculator using Java switch Statement

Output 1

Choose an operator: +, -, *, or /
*
Enter first number
3
Enter second number
9
3.0 * 9.0 = 27.

Here, we have used the Scanner class to take 3 inputs from the user.

Since the operator matches the case '*', so the corresponding codes are executed.

result = number1 * number2;
System.out.println(number + " * " + number2 + " = " + result);
break;

These statements compute the product of two numbers and print the output. Finally, the break statement ends the switch statement.

Similarly, for different operators, different cases are executed.

Output 2

Choose an operator: +, -, *, or /
+
Enter first number
21
Enter second number
8
21.0 + 8.0 = 29.0

Output 3

Choose an operator: +, -, *, or /
-
Enter first number
9
Enter second number
3
9.0 - 3.0 = 6.0

Output 4

Choose an operator: +, -, *, or /
/
Enter first number
24
Enter second number
8
24.0 / 8.0 = 3.0

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