C++ Tutorial E02 Final Code

#include <iostream>

using namespace std;

int main()
{
    /* 0. PREPREQUISITES: Comparison Operators
        Greater than:       >
        Less than:          <
        Greater or equal:   >=
        Less or equal:      <=
        Equal:              ==
        Not equal:          !=
    */


    /* 1. Basic structure:

        if ( condition ) {
            [lines of code to execute if true];
        }

    */

    cout << "How old are you? \n";
    int age;
    cin >> age;

    if (age >= 18) {
        cout << "Please come in!\n";
    }
    cout << "Exiting...\n";


    // 2. Else statements
    /*

        if ( condition ) {
            [lines of code to execute if true];
        }
        else {
            [lines of code to execute if false];
        }

    */

    if (age >= 18) {
        cout << "Please come in!\n";
    }
    else {
        cout << "You are not old enough!\n";
    }


    // 3. Else if statements
    /*

        if ( condition ) {
            [ lines of code to execute if true ];
        }
        else if ( condition2 ) {
            [ lines of code to execute if condition2 is true ];
        }
        else {
            [ lines of code to execute if all conditions are false];
        }

    */


    if (age < 18) {
        cout << "You are not old enough!\n";
    }
    else if (age > 30) {
        cout << "You are not young enough!\n";
    }
    else {
        cout << "Please come in!\n";
    }


    // 4. One-statement ifs
    if (age < 18)
        cout << "You are not old enough!\n";
    else if (age > 30)
        cout << "You are not young enough!\n";
    else
        cout << "Please come in!\n";




}