Hello World in C++

From the C++ cheat sheet · Getting Started · verified Jul 2026

The entry point and console output.

cpp

// Quick Reference
#include <iostream>

int main() {
    std::cout << "Hello, World!\n";
}

💡 std::cout << chains output; std::cin >> reads whitespace-separated input.

⚡ Prefer "\n" over std::endl in hot loops - endl flushes the buffer every call.

📌 main returns int; a missing return in main implicitly returns 0 (success).

🟢 Qualify with std:: rather than "using namespace std;" to avoid name clashes.

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