Aapka Pehla C++ Program

Har C++ program main naam ke function mein execution shuru karta hai. #include <iostream>, input/output library ko la deta hai, aur using namespace std aapko har baar std::cout ke bajaye bas cout likhne deta hai — yeh convenience poore course mein istemal ki gayi hai, halaanke bare real-world codebases aksar explicit std:: prefix prefer karte hain.

Compiling sab se pehle hoti hai

Jab aap run dabate hain, compiler (g++) ek bhi line execute karne se pehle aapki poori file ko ek binary mein translate kar deta hai. Agar kahin bhi koi type error ya syntax mistake hai, to kuch bhi nahi chalta — aapko output ke bajaye ek compile error milta hai.

Comments

Comments C aur zyadatar C-family languages ki tarah kaam karte hain: line mein // ke baad jo bhi likha ho use bilkul ignore kar diya jaata hai, aur yeh sirf isliye hote hain taake baad mein code parhne wale log samajh sakein ke kuch is tarah kyun likha gaya hai.

Khud chala kar dekhein

Yeh raha ek chhota program jisme ek comment aur do cout statements hain. Neeche dikhaya gaya output waqai execute kar ke nikala gaya hai — text badal kar khud bhi example ke neeche button se chala kar dekhein.

// This is a comment - C++ ignores it
#include <iostream>
using namespace std;

int main() {
    cout << "Hello, World!" << endl;
    cout << "Welcome to C++." << endl;
    return 0;
}

Hello, World!
Welcome to C++.

Aage: variables aur types — fundamental types, auto type inference, aur const.