C++入门：从基础语法到核心实战

学习C一基础语法与核心概念C是一种高效、灵活的编程语言广泛应用于系统开发、游戏引擎和高性能计算等领域。以下内容涵盖C基础语法、核心概念及代码示例适合初学者快速入门。变量与数据类型C是静态类型语言变量需声明类型后才能使用。基本数据类型包括int整数如42float/double浮点数如3.14char单个字符如Abool布尔值true/false#include iostream using namespace std; int main() { int age 25; double price 99.99; char grade A; bool is_active true; cout Age: age endl; cout Price: price endl; cout Grade: grade endl; cout Active: is_active endl; return 0; }控制结构C支持条件语句和循环结构逻辑控制与C语言类似。条件语句int score 85; if (score 90) { cout Excellent! endl; } else if (score 60) { cout Passed. endl; } else { cout Failed. endl; }循环结构// for循环 for (int i 0; i 5; i) { cout Iteration i endl; } // while循环 int count 0; while (count 3) { cout Count: count endl; count; }函数函数是代码复用的基本单元。C支持函数重载同一函数名不同参数列表。// 定义函数 int add(int a, int b) { return a b; } // 函数重载 double add(double a, double b) { return a b; } int main() { cout add(2, 3) endl; // 输出 5 cout add(2.5, 3.7) endl; // 输出 6.2 return 0; }指针与引用指针存储内存地址引用是变量的别名。int num 10; int* ptr num; // 指针指向num的地址 int ref num; // 引用绑定到num cout Value via pointer: *ptr endl; // 解引用 cout Value via reference: ref endl; *ptr 20; // 通过指针修改值 cout Updated num: num endl;面向对象基础C支持类与对象封装是核心特性之一。class Rectangle { private: int width, height; public: // 构造函数 Rectangle(int w, int h) : width(w), height(h) {} // 成员函数 int area() { return width * height; } }; int main() { Rectangle rect(5, 10); cout Area: rect.area() endl; // 输出 50 return 0; }STL容器示例标准模板库STL提供常用数据结构如vector动态数组。#include vector #include algorithm int main() { vectorint nums {3, 1, 4, 1, 5}; // 遍历 for (int num : nums) { cout num ; } cout endl; // 排序 sort(nums.begin(), nums.end()); for (int num : nums) { cout num ; } return 0; }总结本文介绍了C的基础语法包括变量、控制结构、函数、指针、类和STL容器。后续内容将深入讨论继承、多态、模板等高级特性。通过实践代码示例可逐步掌握C的核心编程范式。 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