cpp code for calculator code example

Example 1: c++ calculator program using switch case

#include<iostream>
using namespace std;
int calculator(int num1,int num2,int num3);
int main()
{
    //int num1,num2,num3,choice;
    int a,b,c,choice;
    cout<<"enter the first number"<<endl;
    cin>>a;
    cout<<"enter the second number"<<endl;
    cin>>b;
    cout<<"************************"<<endl;
    cout<<"****Make your choice****"<<endl;
    cout<<"1.Addition"<<endl;
    cout<<"2.Subtraction"<<endl;
    cout<<"3.Multiplication"<<endl;
    cout<<"4.Division"<<endl;
    cout<<"************************"<<endl;

    choice=calculator(a,b,c);
    return 0;
}
int calculator(int num1,int num2,int num3)
{

    int choice;
    cin>>choice;
    switch(choice)
    {

        case 1: cout<<"you have selected Addition"<<endl;
                num3=num1+num2;
                cout<<"Addition of two numbers is "<<num3<<endl;
                break;

        case 2: cout<<"you have selected Subtraction"<<endl;
                num3=num1-num2;
                cout<<"Subtraction of two numbers is "<<num3<<endl;
                break;

        case 3: cout<<"you have selected Multiplication"<<endl;
                num3=num1*num2;
                cout<<"Multiplication of two numbers is "<<num3<<endl;
                break;

        case 4: cout<<"You have selected Division"<<endl;
                num3=num1/num2;
                cout<<"Division of two numbers is "<<num3<<endl;
                break;

        default: cout<<"You have entered wrong choice"<<endl;
                    break;
    }
}

Example 2: how to make a calculator in c++

// This is for beginners

#include <iostream>

using namespace std;

void greetings() {
    cout << "welcome to the calculator made in c++ :D\n";
}

void instructions() {
    cout << "Here is the operators you can use + - / *\n";
}

int main()
{
    greetings();
    instructions();
    int num1, num2;
    char op;
    int result;
    char again = 'Y';

    while (again == 'y' || again == 'Y') {



        cout << "\nEnter your first digit: ";
        cin >> num1;

        cout << "\nEnter your operator digit: ";
        cin >> op;

        cout << "\nEnter your second digit: ";
        cin >> num2;

        if (op == '+') {
            result = num1 + num2;
        }
        else if (op == '-') {
            result = num1 - num2;
        }
        else if (op == '*') {
            result = num1 * num2;
        }
        else if (op == '/') {
            result = num1 / num2;
        }
        else {
            cout << "Invalid operator";
        }

        cout << "= " << result;
        cout << "\nDo you want to restart the calculator? (Y or N)";
        cin >> again;
    }

    system("pause>0");

    return 0;
}