3.2.2 string对象上的操作-使用getline读取一整行

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书中页数：P78
代码名称：getline.cc

#include <string> 
using std::string; using std::getline;

#include <iostream> 
using std::cin; using std::cout; using std::endl;

int main() 
{
	string line;

	// read input a line at a time until end-of-file
	while (getline(cin, line))
		cout << line << endl;

	return 0;
}