Examples of switch Statement in C++

// C Program to create a simpe calculator using switch
// statement
#include <iostream>
#include <stdlib.h>
using namespace std;

// driver code
int main()
{
    // switch variable
    char choice;
    // operands
    int x, y;

    while (1) {
        cout << "Enter the Operator (+,-,*,/)\nEnter x to "
                "exit\n";
        cin >> choice;

        // for exit
        if (choice == 'x') {
            exit(0);
        }

        cout << "Enter the two numbers: ";
        cin >> x >> y;

        // switch case with operation for each operator
        switch (choice) {
        case '+':
            cout << x << " + " << y << " = " << x + y
                 << endl;
            break;

        case '-':
            cout << x << " - " << y << " = " << x - y
                 << endl;
            break;

        case '*':
            cout << x << " * " << y << " = " << x * y
                 << endl;
            break;
        case '/':
            cout << x << " / " << y << " = " << x / y
                 << endl;
            break;
        default:
            printf("Invalid Operator Input\n");
        }
    }
    return 0;
}

// C++ program to returns day based on the numeric value.
#include <iostream>
using namespace std;

class Day {
private:
    int day = 3;

public:
    void set_data()
    {
        cout << "Enter no of day you want to display: ";
        cin >> day;
    }

    void display_day()
    {
        switch (day) {
        case 1:
            cout << "MONDAY";
            break;

        case 2:
            cout << "TUESDAY";
            break;

        case 3:
            cout << "WEDNESDAY";
            break;

        case 4:
            cout << "THURSDAY";
            break;

        case 5:
            cout << "FRIDAY";
            break;

        case 6:
            cout << "SATURDAY";
            break;

        case 7:
            cout << "SUNDAY";
            break;

        default:
            cout << "INVALID INPUT";
            break;
        }
    }
};

main()
{
    Day d1;

    d1.display_day();

    return 0;
}

// C++ Program to print different choices using enum values
// and class

#include <iostream>
#include <map>
#include <string>
using namespace std;

// Define an enum class for the choices
enum class Choice { A, B, C };

// Create a map to associate strings with the enum values
map<std::string, Choice> stringToEnumMap
    = { { "A", Choice::A },
        { "B", Choice::B },
        { "C", Choice::C } };

int main()
{
    // The input string
    string x = "A";

    // Convert the string to the corresponding enum using
    // the map
    Choice choice = stringToEnumMap[x];

    // Use a switch statement on the enum
    switch (choice) {
    case Choice::A:
        cout << "Choice is A";
        break;
    case Choice::B:
        cout << "Choice is B";
        break;
    case Choice::C:
        cout << "Choice is C";
        break;
    default:
        cout << "Choice other than A, B and C";
        break;
    }

    return 0;
}

/* The enum class can be used for choice sets
from different projects or programs,
hence improving modularity*/