Building a Simple Consecutive Calculator in C++

Muhammad Ali — Tue, 28 Jul 2026 11:55:01 +0000

Hey everyone!

I'm a software engineering student, and I just built a console-based Consecutive Calculator in C++. It allows you to perform basic arithmetic operations continuously on your result until you choose to stop!

Features:

Supports basic operators: Addition (+), Subtraction (-), Multiplication (*), Division (/), and Modulo (%).
Error handling: Prevents crashing on division/modulo by zero.
Continuous mode: Uses the previous result as the first number for the next calculation.

The Code:

Here is the implementation:

`#include <iostream>
using namespace std;
int main()
{
    int first, second, operate, result;
    char consent = 'y';
    cout << "Welcome to single consequetive calculator..." << endl;
    cout << "Enter the first number: ";
    cin >> first;
    do {
        cout << "Enter the second number: ";
        cin >> second;
        cout << "Tell me which computation you want?\n 1. + \n 2. -\n 3. *\n 4. / \n 5. %\n ";
        cout << "Press only numeric keys for computation \n";
        cout << "operator: ";
        cin >> operate;
        switch (operate) {
        case 1: result = first + second; break;
        case 2: result = first - second; break;
        case 3: result = first * second; break;
        case 4:
            if (second == 0) { cout << "Cannot divide by zero!\n"; continue; }
            result = first / second;
            break;
        case 5:
            if (second == 0) { cout << "Cannot modulo by zero!\n"; continue; }
            result = first % second;
            break;
        default:
            cout << "Invalid choice! Try again.\n";
            continue; 
        }

        cout << "Result: " << result << endl;
        cout << "\n Do you want to more compute with the result \n Press 'y' for YES else any key on keyboard... \n ";
        cin >> consent;
        if (consent == 'y' || consent == 'Y')
            first = result;
    } while (consent == 'y' || consent == 'Y');
    return 0;
}`

Please give me feedback on my work or nay tips to improve it...

DEV Community: Muhammad Ali

Building a Simple Consecutive Calculator in C++