C++ Program to Make a Simple Calculator to Add, Subtract, Multiply or Divide Using switch…case


Example to create a simple calculator to add, subtract, multiply and divide using a switch and break statement.


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

  • C++ switch..case Statement
  • C++ break and continue Statement

This program takes an arithmetic operator (+, -, *, /) and two operands from a user and performs the operation on those two operands depending upon the operator entered by the user.


Example: Simple Calculator using a switch statement

# include <iostream>
using namespace std;

int main()
{
    char op;
    float num1, num2;

    cout << "Enter operator either + or - or * or /: ";
    cin >> op;

    cout << "Enter two operands: ";
    cin >> num1 >> num2;

    switch(op)
    {
        case '+':
            cout << num1+num2;
            break;

        case '-':
            cout << num1-num2;
            break;

        case '*':
            cout << num1*num2;
            break;

        case '/':
            cout << num1/num2;
            break;

        default:
            // If the operator is other than +, -, * or /, error message is shown
            cout << "Error! operator is not correct";
            break;
    }

    return 0;
}

 

Output

Enter operator either + or - or * or divide : -
Enter two operands: 
3.4
8.4
3.4 - 8.4 = -5.0

 

This program takes an operator and two operands from the user.

The operator is stored in variable op and two operands are stored in num1 and num2respectively.

Then, switch…case statement is used for checking the operator entered by the user.

If a user enters + then, statements for iscase: '+' executed and the program is terminated.

If the user enters – then, statements for iscase: '-' executed and the program is terminated.

This program works similarly for * and / operator. But, if the operator doesn’t match any of the four character [ +, -, * and / ], default statement is executed which displays an error message.

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