Algorithm

1. Start

2. Declare variables:
   - num1, num2 (for operands)
   - choice (for operation selection)
   - result (for storing the result)

3. Display menu to the user:
   - Addition
   - Subtraction
   - Multiplication
   - Division

4. Take user input for choice.

5. Use a switch-case statement based on the user's choice:
   a. Case 1: Addition
      - Take user input for num1 and num2.
      - Add num1 and num2 and store the result.

   b. Case 2: Subtraction
      - Take user input for num1 and num2.
      - Subtract num2 from num1 and store the result.

   c. Case 3: Multiplication
      - Take user input for num1 and num2.
      - Multiply num1 and num2 and store the result.

   d. Case 4: Division
      - Take user input for num1 and num2.
      - Check if num2 is not equal to 0.
        - If true, divide num1 by num2 and store the result.
        - If false, display an error message (division by zero).

   e. Default:
      - Display an error message for an invalid choice.

6. Display the result if the operation was successful.

7. End

Code Examples

#1 Code Example-C++ Program to Make a Simple Calculator Using Switch Case Statement

Code - C++ Programming

// C++ Program to Make a Simple Calculator Using Switch Case Statement
#include <iostream>
using namespace std;

int main(){
    float num1, num2;
    char op;
    
    // Asking for input
    cout << "Enter the first number: ";
    cin >> num1;
    cout << "Enter the second number: ";
    cin >> num2;
    
    cout << "Enter operator: +, -, *, /: ";
    cin >> op;
    
    switch(op){
        case '+':
            cout << num1 << " + " << num2 << " = " << num1 + num2;
            break;
        
        case '-':
            cout << num1 << " - " << num2 << " = " << num1 - num2;
            break;
        
        case '*':
            cout << num1 << " * " << num2 << " = " << num1 * num2;
            break;
        
        case '/':
            cout << num1 << " / " << num2 << " = " << num1 / num2;
            break;
        
        default:
            cout << "Invalid Operator";
            break;
    }
    return 0;
}
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Output

x
–
+
cmd
Enter the first number: 7
Enter the second number: 5
Enter operator: +, -, *, /: *
7 * 5 = 35

#2 Variable Declaration:'num1' and 'num2' are variables to store the two numbers entered by the user. 'op' is a variable to store the operator entered by the user.

Code - C++ Programming

float num1, num2;
char op;
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#3 User Input: The program prompts the user to enter two numbers and an operator. The values are then stored in num1, num2, and op, respectively.

Code - C++ Programming

cout << "Enter the first number: ";
cin >> num1;
cout << "Enter the second number: ";
cin >> num2;
cout << "Enter operator: +, -, *, /: ";
cin >> op;
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#4 Switch Case: The switch statement checks the value of the op variable.

Code - C++ Programming

switch(op){
    case '+':
        cout << num1 << " + " << num2 << " = " << num1 + num2;
        break;
    case '-':
        cout << num1 << " - " << num2 << " = " << num1 - num2;
        break;
    case '*':
        cout << num1 << " * " << num2 << " = " << num1 * num2;
        break;
    case '/':
        cout << num1 << " / " << num2 << " = " << num1 / num2;
        break;
    default:
        cout << "Invalid Operator";
        break;
}
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#5 Return Statement: The program ends with a return statement indicating successful execution

Code - C++ Programming

return 0;
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Demonstration

C++ Programing Example to Make a Simple Calculator Using Switch Case Statement-DevsEnv