Algorithm

  1. Initialization:

    • Declare variables for operand1, operand2, result, and operator.
    • Prompt the user to enter operand1 and operand2.
    • Prompt the user to choose an operation (+, -, *, /).

  2. Input:

    • Read operand1, operand2, and operator from the user.

  3. Switch...case structure:

    • Use a switch statement to perform different operations based on the chosen operator.
    • Cases should include addition (+), subtraction (-), multiplication (*), and division (/).

  4. Perform Calculation:

    • Inside each case, perform the corresponding mathematical operation on operand1 and operand2.
    • Handle division by zero if the operator is '/'.

  5. Display Result:

    • Print the result of the calculation.

  6. Default Case:

    • Handle the default case if the user enters an invalid operator.

 

Code Examples

#1 Code Example- Simple Calculator using Java switch Statement

Code - Java Programming

import java.util.Scanner;

class Main {
  public static void main(String[] args) {

    char operator;
    Double number1, number2, result;

    // create an object of Scanner class
    Scanner input = new Scanner(System.in);

    // ask users to enter operator
    System.out.println("Choose an operator: +, -, *, or /");
    operator = input.next().charAt(0);

    // ask users to enter numbers
    System.out.println("Enter first number");
    number1 = input.nextDouble();

    System.out.println("Enter second number");
    number2 = input.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;
    }

    input.close();
  }
}
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Output

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

#2 Code Example with Java Programming

Code - Java Programming

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

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

#3 Code Example with Java Programming

Code - Java Programming

start coding...
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Output

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

#4 Code Example with Java Programming

Code - Java Programming

start coding...
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Output

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

Java Programing Example to Make a Simple Calculator Using switch...case-DevsEnv