4_10.cpp

//strtype4.cpp
#include<iostream>
#include<string>
#include<cstring>
int main()
{
	using namespace std;
	char charr[20];
	string str;

	cout << "Length of string in charr before input: "
		<< strlen(charr) << endl;
	cout << "Length of string in str before input: "
		<< str.size() << endl;
	cout << "Enter a line of text: \n";
	cin.getline(charr, 20);                          //指出最大长度
	cout << "You entered: " << charr << endl;
	cout << "Enter another line of text:\n";
	getline(cin, str);                      //此时cin是一个参数，不需指定长度
	cout << "You entered: " << str << endl;
	cout<< "Length of string in charr after input: "
		<< strlen(charr) << endl;
	cout << "Length of string in str after input: "
		<< str.size() << endl;
	
	cin.get();
	cin.get();
	cin.get();
	return 0;
}