C++ Basic Syntax

Overview

C++ basic syntax is the foundation of learning C++ programming. This chapter will introduce the basic structure of C++ programs, syntax rules, keywords, identifiers, and other core concepts to lay a solid foundation for in-depth learning.

🏗️ Basic Structure of C++ Programs

Simplest C++ Program

#include <iostream>

int main() {
    std::cout << "Hello, World!" << std::endl;
    return 0;
}

Program Structure Analysis

graph TD
    A[C++ Program] --> B[Preprocessor Directives]
    A --> C[Global Declarations]
    A --> D[main Function]
    A --> E[Other Functions]
    
    B --> B1[#include]
    B --> B2[#define]
    B --> B3[#ifdef]
    
    C --> C1[Global Variables]
    C --> C2[Function Declarations]
    C --> C3[Class Declarations]
    
    D --> D1[Program Entry Point]
    D --> D2[Returns int Type]
    
    E --> E1[User-defined Functions]
    E --> E2[Class Member Functions]

Complete Program Example

// Preprocessor directives
#include <iostream>
#include <string>

// Using namespace
using namespace std;