如何读取和写入STL C ++字符串？ [英] How to read and write a STL C++ string?

问题描述

#include<string>
...
string in;

//How do I store a string from stdin to in?
//
//gets(in) - 16 cannot convert `std::string' to `char*' for argument `1' to 
//char* gets (char*)' 
//
//scanf("%s",in) also gives some weird error

b $ b

同样，如何在中写出到stdout或文件

Similarly, how do I write out in to stdout or to a file??

推荐答案

您试图将C风格的I / O与C ++类型混合。当使用C ++时，应该使用std :: cin和std :: cout流作为控制台输入和输出。

You are trying to mix C style I/O with C++ types. When using C++ you should use the std::cin and std::cout streams for console input and output.

#include<string>
#include<iostream>
...
std::string in;
std::string out("hello world");

std::cin >> in;
std::cout << out;

但是当读取字符串时std :: cin在遇到空格或换行符时停止读取。您可以使用 getline 从控制台获取整行输入。

But when reading a string std::cin stops reading as soon as it encounters a space or new line. You may want to use getline to get a entire line of input from the console.

std::getline(std::cin, in);

您使用与文件相同的方法（处理非二进制数据时）。

You use the same methods with a file (when dealing with non binary data).

std::ofstream ofs('myfile.txt');

ofs << myString;

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