C++ Program to Make a Simple Calculator Using switch…case

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calculator using switch case
(Last Updated On: December 12, 2018)

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

To understand this program Simple calculator using switch case, you should have the knowledge of following C++ programming topics:

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

Below is the Video for switch…case Explanation or Jump to Program

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

Simple Calculator using switch case 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 the user enters + then, statements for case: '+' is executed and the program is terminated.

If the user enters – then, statements for case: '-' is 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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