variabel.cpp

#include <iostream>
#include <string> // Recommended for using string variables
using namespace std;

int main() {
    // ==========================================
    // 1. DATA TYPES & VARIABLE DECLARATION
    // ==========================================
    int myNum = 5;            // Integer (whole numbers without decimals)
    double myFloatNum = 5.99; // Floating point number (numbers with decimals)
    char myLetter = 'D';      // Character (single character in single quotes)
    string myText = "Hello";  // String (text wrapped in double quotes)
    bool myBoolean = true;    // Boolean (true/1 or false/0)

    // ==========================================
    // 2. PRINTING VARIABLES IN OUTPUT
    // ==========================================
    int myAge = 35;
    cout << "=== PRINTING VARIABLES ===" << endl;
    cout << "I am " << myAge << " years old." << endl;

    // Combining multiple variables in a single output statement
    string name = "John";
    int age = 35;
    double height = 6.1;
    cout << name << " is " << age << " years old and " << height << " feet tall." << endl;

    // ==========================================
    // 3. CONSTANTS (Unchangeable Variables)
    // ==========================================
    // The 'const' keyword creates read-only variables.
    // Trying to assign a new value to a const variable will cause a compile error.
    const int minutesPerHour = 60; // Value is locked to 60
    const double PI = 3.14159;    // Useful for values that should never change

    cout << "\n=== CONSTANTS ===" << endl;
    cout << "Minutes per hour: " << minutesPerHour << endl;

    return 0;
}