68 C++ - 标准输入流

标准输入流对象cin，重点掌握的函数

cin.get() //一次只能读取一个字符
cin.get(一个参数) //读一个字符
cin.get(两个参数)//可以读字符串
cin.getline()
cin.ignore()
cin.peek()
cin.putback()

//cin.get
void test01(){
#if 0
	char ch = cin.get();
	cout << ch << endl;

	cin.get(ch);
	cout << ch << endl;


	//链式编程
	char char1, char2, char3, char4;
	cin.get(char1).get(char2).get(char3).get(char4);

	cout << char1 << " " << char2 << "" << char3 <<  " " << char4 << " ";
#endif

	char buf[1024] = { 0 };
	//cin.get(buf.1024);
	cin.getline(buf,1024);
	cout << buf;
}

//cin.ignore
void test02(){

	char buf[1024] = { 0 };
	cin.ignore(2); //忽略缓冲区当前字符
	cin.get(buf,1024);
	cout << buf << endl;
}

//cin.putback 将数据放回缓冲区
void test03(){

	//从缓冲区取走一个字符
	char ch = cin.get();
	cout << "从缓冲区取走的字符:" << ch << endl;
	//将数据再放回缓冲区
	cin.putback(ch);
	char buf[1024] = { 0 };
	cin.get(buf,1024);
	cout << buf << endl;

}

//cin.peek 偷窥
void test04(){
	
	//偷窥下缓冲区的数据
	char ch = cin.peek();
	cout << "偷窥缓冲区数据:" << ch << endl;
	char buf[1024] = { 0 };
	cin.get(buf, 1024);
	cout << buf << endl;
}