Structure of a C++ Program

A C++ program consists of preprocessor directives, namespaces, function declarations, and the main() function which is the entry point.

Headers and Includes

Headers provide declarations for standard library functions and classes. You include them using #include directive.

• #include <iostream> for input/output operations
• #include <vector> for dynamic arrays
• #include <string> for string manipulation
• #include <algorithm> for standard algorithms

Namespaces

Namespaces organize code and prevent naming conflicts. The std namespace contains the C++ Standard Library.

First C++ Program

Your first C++ program prints a message to the console using cout and ends with a return statement.

#include <iostream>
using namespace std;

int main() {
    cout << "Welcome to C++ programming" << endl;
    return 0;
}

Welcome to C++ programming is the output produced by the example program.