C++

C++ Program Structure

C++ 145 views Dec 22, 2025 1 min read

A C++ program consists of different sections that work together to execute a task. Each section has a specific purpose.

1. Documentation Section

Used to write comments that describe the program.

// This program displays a message

2. Preprocessor Directive Section

Includes required header files.

#include

  • #include tells the compiler to include input-output functions.

3. Namespace Section

Defines the scope of identifiers.

using namespace std;

  • Avoids writing std:: before standard library names.

4. Global Declaration Section

Declares global variables and functions (optional).

int x;

5. Main Function

Execution of the program starts from main().

int main() {
    // statements
    return 0;
}

  • int indicates return type

  • return 0 ends the program successfully

6. Body of the Program

Contains executable statements.

cout << "Hello, World!";

Example Program

#include 
using namespace std;

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

Key Points

  • Execution always begins with main()

  • Header files provide built-in functions

  • Statements end with a semicolon (;)

  • C++ is case-sensitive

Conclusion

Understanding the structure of a C++ program helps in writing organized, error-free, and readable code.

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