boolean.cpp

#include <iostream>
using namespace std;

int main() {
    // ==========================================
    // 1. BOOLEAN VALUES & DATA TYPE
    // ==========================================
    cout << "=== 1. BOOLEAN VALUES ===" << endl;
    
    // 'bool' can only hold true (1) or false (0)
    bool isCodingFun = true;
    bool isFishTasty = false;

    // By default, C++ outputs 1 for true and 0 for false
    cout << "isCodingFun : " << isCodingFun << endl; // Output: 1
    cout << "isFishTasty : " << isFishTasty << endl; // Output: 0


    // ==========================================
    // 2. PRINTING true/false WITH boolalpha
    // ==========================================
    cout << "\n=== 2. USING boolalpha ===" << endl;
    
    // Use 'boolalpha' to print "true" or "false" instead of 1 or 0
    cout << boolalpha; 
    cout << "isCodingFun : " << isCodingFun << endl; // Output: true
    cout << "isFishTasty : " << isFishTasty << endl; // Output: false


    // ==========================================
    // 3. BOOLEAN EXPRESSIONS (Comparisons)
    // ==========================================
    cout << "\n=== 3. BOOLEAN EXPRESSIONS ===" << endl;
    
    int x = 10;
    int y = 9;

    // Comparing values returns true (1) or false (0)
    cout << "Is x > y?   : " << (x > y) << endl;  // Output: true
    cout << "Is 10 == 15?: " << (10 == 15) << endl; // Output: false


    // ==========================================
    // 4. STORING RESULT IN A BOOL VARIABLE
    // ==========================================
    cout << "\n=== 4. STORE RESULT IN VARIABLE ===" << endl;
    
    // You can store a comparison result directly inside a bool variable
    bool isGreater = (x > y);
    cout << "isGreater   : " << isGreater << endl; // Output: true


    // ==========================================
    // 5. REAL LIFE EXAMPLE (Decision Making)
    // ==========================================
    cout << "\n=== 5. REAL LIFE EXAMPLE ===" << endl;
    
    int myAge = 25;
    int votingAge = 18;

    // Check if eligible to vote using >= (greater than or equal to)
    if (myAge >= votingAge) {
        cout << "Old enough to vote!" << endl;
    } else {
        cout << "Not old enough to vote." << endl;
    }

    return 0;
}