C Primer Plus书中代码注释-chapter17_13_get_gun.cpp

chapter17_13_get_gun.cpp

#include <iostream>
const int Limit = 255;

int main(){
	using std::cout;
	using std::cin;
	using std::endl;
	
	char input[Limit];
	
	cout << "Enter a string for getline() processing:\n";
	cin.getline(input, Limit, '#');				//从输入流获取数据，第三个参数规定直到遇到分界字符#停止输入，并丢弃输入中的分界字符#
	cout << "Here is your input:\n";
	cout << input << "\nDone with phase 1\n";	//输出分界字符#之前的input内容
	
	char ch;
	cin.get(ch);								//从#分界字符的后面继续读取输入流，这里只读取了一个char字符
	cout << "The nexr input character is " << ch << endl;
	
	if(ch != '\n')		//如果ch没有读取到换行符，执行该循环
		cin.ignore(Limit, '\n');		//丢弃接下来的255个字符，直到到达第一个换行符，然后丢弃换行符
	
	cout << "Enter a string for get() processing:\n";
	cin.get(input, Limit, '#');			//从输入流获取数据，第三个参数规定直到遇到分界字符#停止输入，并保留输入中的分界字符#
	cout << "Here is your input:\n";
	cout << input << "\nDone with phase 2\n";
	
	cin.get(ch);						//这里获得的是#的char字符，因为getline抽取了第三个参数并丢弃，然而get抽取第三个参数并保留在输入流中
	cout << "The next input character is " << ch << endl;
	
	return 0;
}

/**
Enter a string for getline() processing:
Please pass
me a #3 melon!
Here is your input:
Please pass
me a
Done with phase 1
The nexr input character is 3
Enter a string for get() processing:
I still
want my #3 melon!
Here is your input:
I still
want my
Done with phase 2
The next input character is #
**/