HackingC++ 机翻阅读记录 Chapter2-Input&Output

个人笔记向+google机翻(机翻确实很多细节描述不清，看不懂记得参考原文)
原文参见：https://hackingcpp.com/cpp/be...

Input&Output

1.Command Line Arguments 命令行参数

• What &Why
• How to Access in C++

int main (int const argc, char const* argv/*a pointer to a constant char*/) {

• Argument Conversion
• Conversion to std::string, int, …

 auto word  = string(argv[1]);
 int  times = atoi(argv[2]);

• String → Number Conversion Functions

2.File Input&Output 文件输入输出

• Write Text File
• Read Text File

#include 
std::ofstream os {"squares.txt"};
os << xxxxx ; 
std::ifstream is {"squares.tst"};
is >> xxxxx ; 

• Open/Close Files

 os.open("squares.txt");
 os.close("squares.txt");

• File Open Modes

3.Stream Input&Output 流输入输出

• Example: Point Coordinate I/O

4.Recover From Input Error 从输入错误中恢复