Menu Driven C++ Program for a Simple Calculator

In this tutorial, we will be discussing a program to create a menu driven program for a simple calculator.

This program will give user the ability to choose among the following mathematical operations − addition, subtraction, multiplication, division, HCF and LCM.

Example

 Live Demo

#include <bits/stdc++.h>
using namespace std;
//displaying the menu
void menu(){
   cout << "Press 1 to calculate Sum of Numbers\n";
   cout << "Press 2 to calculate Difference of Numbers\n";
   cout << "Press 3 to calculate Product of numbers\n";
   cout << "Press 4 to calculate Division of numbers\n";
   cout << "Press 5 to calculate HCF of numbers\n";
   cout << "Press 6 to calculate LCM of numbers\n";
   cout << "Press 7 to exit\n";
}
//calculating and outputting result
void result(int choice, int a, int b){
   switch (choice) {
      case 1: {
         cout << "Sum is " << (a + b) << "\n";
         break;
      }
      case 2: {
         cout << "Difference is " << (a - b) << "\n";
         break;
      }
      case 3: {
         cout << "Product is " << (a * b) << "\n";
         break;
      }
      case 4: {
         cout << "Division is " << (a / b) << "\n";
         break;
      }
      case 5: {
         cout << "GCD is " << __gcd(a, b) << "\n";
         break;
      }
      case 6: {
            cout << "LCM is "<< ((a * b) / __gcd(a, b))<< "\n";
            break;
      }
      case 7: {
         cout << "Thank you\n";
         break;
      }
      default:
      printf("Wrong Input\n");
   }
}
int main(){
   int a = 5, b = 7;
   int choice, res;
   menu();
   cout << "Enter your choice:\n";
   choice = 1;
   cout << "Choice is " << choice << endl;
   result(choice, a, b);
   return 0;
}

Output

Press 1 to calculate Sum of Numbers
Press 2 to calculate Difference of Numbers
Press 3 to calculate Product of numbers
Press 4 to calculate Division of numbers
Press 5 to calculate HCF of numbers
Press 6 to calculate LCM of numbers
Press 7 to exit
Enter your choice:
Choice is 1
Sum is 12