C++ 如何使用cin从用户那里读取完整的一行？
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How to read a complete line from the user using cin?
提问by FuzionSki
Here is my current C++ code. I would like to know how to writea line of code. Would I still use cin.getline(y)or something different? I've checked, but can't find anything.
When I run it, it works perfectly except it only types oneword instead of the full lines I need it to output. This is what I need help with. I've outlined it in the code.
这是我当前的 C++ 代码。我想知道如何写一行代码。我还会使用cin.getline(y)或不同的东西吗？我已经检查过，但找不到任何东西。当我运行它时，它工作得很好，只是它只输入一个单词而不是我需要它输出的完整行。这就是我需要帮助的。我已经在代码中概述了它。
Thanks for helping
谢谢你的帮助
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <fstream>
using namespace std;
int main()
{
char x;
cout << "Would you like to write to a file?" << endl;
cin >> x;
if (x == 'y' || x == 'Y')
{
char y[3000];
cout << "What would you like to write." << endl;
cin >> y;
ofstream file;
file.open("Characters.txt");
file << strlen(y) << " Characters." << endl;
file << endl;
file << y; // <-- HERE How do i write the full line instead of one word
file.close();
cout << "Done. \a" << endl;
}
else
{
cout << "K, Bye." << endl;
}
}
回答by ybakos
The code cin >> y;only reads in one word, not the whole line. To get a line, use:
代码cin >> y;只读取一个单词，而不是整行。要获得一条线，请使用：
string response;
getline(cin, response);
Then responsewill contain the contents of the entire line.
然后response将包含整行的内容。
回答by hidayat
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <string>
int main()
{
char write_to_file;
std::cout << "Would you like to write to a file?" << std::endl;
std::cin >> write_to_file;
std::cin >> std::ws;
if (write_to_file == 'y' || write_to_file == 'Y')
{
std::string str;
std::cout << "What would you like to write." << std::endl;
std::getline(std::cin, str);
std::ofstream file;
file.open("Characters.txt");
file << str.size() << " Characters." << std::endl;
file << std::endl;
file << str;
file.close();
std::cout << "Done. \a" << std::endl;
}
else
std::cout << "K, Bye." << std::endl;
}
回答by Yini Guo
string str;
getline(cin, str);
cin >> ws;
You can use getlinefunction to read the whole line instead of reading word by word. And The cin>>wsis there to skip white spaces. And you find some detail about it here : http://en.cppreference.com/w/cpp/io/manip/ws
您可以使用getline函数读取整行而不是逐字读取。而cin>>ws是用来跳过空格的。您可以在此处找到有关它的一些详细信息：http: //en.cppreference.com/w/cpp/io/manip/ws
