getline(cin

C++中的`getline(cin, str)`函数用于从标准输入流（即键盘）读取一行字符串，并将其存储在字符串变量`str`中。该函数会读取换行符之前的所有字符，并将换行符从输入流中移除。

例如，以下代码会将用户输入的一行字符串存储在变量`input`中：

#include <iostream>
#include <string>

int main() {
    std::string input;
    std::cout << "Enter a line of text: ";
    std::getline(std::cin, input);
    std::cout << "You entered: " << input << std::endl;
    return 0;
}

当用户输入一行文本后，程序会将其打印出来。

相关问题

getline cin

getline和cin都是用于从标准输入读取数据的函数，但是它们的使用方式和行为有一些区别。

getline函数会将输入缓冲区中的所有内容都读取完毕，包括换行符。所以如果你想在使用getline之前使用cin读取某个数据，你需要在它们之间清空输入缓冲区，以免影响getline的结果。可以通过调用cin.ignore()函数来实现。

而cin会传递并忽略任何前导白色空格字符，一旦接触到第一个非空格字符即开始阅读。所以使用cin读取字符串时需要注意，如果在读取前有空格或其他空白字符，cin会将其忽略。

总结来说，getline适用于读取整行文本，包括空格和其他特殊字符，而cin适用于读取单个数据，会忽略前导空白字符。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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cin getline

"Cin" and "getline" are both input functions in C++. "Cin" is used to read input from the standard input stream (usually the keyboard), while "getline" is used to read a line of text from any input stream (such as a file or network connection) and store it as a string.

The syntax for using "cin" is as follows:

#include <iostream>

int main() {
  int num;
  std::cout << "Enter a number: ";
  std::cin >> num;
  std::cout << "You entered: " << num << std::endl;
  return 0;
}

The syntax for using "getline" is as follows:

#include <iostream>
#include <string>

int main() {
  std::string input;
  std::cout << "Enter some text: ";
  std::getline(std::cin, input);
  std::cout << "You entered: " << input << std::endl;
  return 0;
}

In the first example, the user is prompted to enter a number, which is then stored in the variable "num" using "cin". In the second example, the user is prompted to enter some text, which is then stored in the string variable "input" using "getline".