输入可变长字符串

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

int ()
{
	size_t arry_size = 10;
	char *p_str = new char[arry_size];
	int count = 0;
	char c;//存放字符

	cout << "Enter some chars:" << endl;
	while (cin.get(c))//每次读取一个字符赋给c
	{
		if (count + 1 >= arry_size)//超出预设长度
		{
			arry_size += 10;//长度增加10
			char *p_temp = new char[arry_size];//申请新空间
			strncpy(p_temp, p_str, count);//将就空间的内容拷贝到新空间
			delete[] p_str;//销毁以前的p_str(p_temp)
			p_str = p_temp;//将新空间p_temp赋给p_str
		}

		p_str[count] = c;
		count++;
	}
	p_str[count] = '