C++ program to make simple calculator using switch case

In this example, you will learn about C++ program to make simple calculator using switch case i.e. Addition, Subtraction, Multiplication, Squares, and Division.

This program uses 6 different cases for performing the different mathematical operation. You have to select different options for addition, subtraction, multiplication, square and division.

C++ program to make simple calculator using switch case

/* C++ program to implement simple functions of a calculator*/

#include<iostream>
using namespace std;

int main()
{
   int choice;
   long num1, num2, x;

   //displaying different options
   cout << "Please choose your option:"
           "\n1 = Addition"
           "\n2 = Subtraction"
           "\n3 = Multiplication"
           "\n4 = Division"
           "\n5 = Squares"
           "\n6 = exit"
           "\n\nChoice: ";
   cin >> choice;

   //while loop check whether the choice is in the given range
   while(choice < 1 || choice > 6)
   {
      cout << "\nPlease choose the above mentioned option."
              "\nChoice: ";
      cin >> choice;
   }

   switch (choice)
   {
      //Addition
      case 1:
         cout << "Enter two numbers: \n";
         cin >> num1 >> num2;
         x = num1 + num2;
         cout << "Sum = " << x;
         break;

      //Subtraction
      case 2:
         cout << "Enter two numbers: \n";
         cin >> num1 >> num2;
         x = num1 - num2;
         cout << "Subtraction = " << x;
         break;

      //Multiplication
      case 3:
         cout << "Enter two numbers: \n";
         cin >> num1 >> num2;
         x = num1 * num2;
         cout << "Product = " << x;
         break;

      //Division
      case 4:
         cout << "Enter Dividend: ";
         cin >> num1;
         cout << "Enter Divisor: ";
         cin >> num2;

         //while loop checks for divisor whether it is zero or not
         while(num2 == 0)
         {
            cout << "\nDivisor cannot be zero."
                    "\nEnter divisor once again: ";
            cin >> num2;
         }
         x = num1 / num2;
         cout << "\nQuotient = " << x;
         break;

      //Square
      case 5:
         cout << "Enter any number: \n";
         cin >> num1;
         x = num1 * num1;
         cout << "Square = " << x;
         break;

      case 6:
         return 0;

      default: cout << "\nError";
   }
}

Output

Explanation

In the above example, we have made a simple calculator in C++ with basic functions.

In a division, there is a special case to check whether divisor is zero.