1. C++ 文件的后缀
   • .cc, .cxx, .cpp, .cp, .c
2. 通过命令行编译程序

1. 编写文件 prog1.ccint main(){    return 0;}2. 执行命令:CC prog1.cc或者:g++ -o prog1 prog1.cc3. 运行生成的文件    Linux 系统生成 a.out    Windows 系统生成 prog1.exe./a.out4. 获取执行结果echo $?

1. 输入/输出流
   • iostream
     • istream: 输入流;
       • cin: 标准输入流;
     • ostream: 输出流;
       • cout: 标准输出流;
       • cerr: 打印错误信息,用于处理 warning, error;
       • clog: 打印一般信息;

// 用户输入两个值,计算这两个值的和#include 
    
     /* * sum function: * Read two numbers and write their sum */int main(){    // prompt user to enter two numbers    std::cout << "Enter two numbers:" << std::endl;    int v1 = 0, v2 = 0;    std::cin >> v1 >> v2;    std::cout << "The sum of " << v1 << " and " << v2              << " is " << v1 + v2 << std::endl;    return 0;}
    

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