accelerated C++后感

#include <iostream>
#include <string>

using namespace std;

int main()
{
    cout << "Please enter your name: ";

    string name;
    cin >> name;

    const string greeting = "Hello, " + name + "!";

    const string spaces(greeting.size(), ' ');
    const string second = "*" + spaces + "*";
    const string first(second.size(), '*');

    cout << endl;
    cout << first << endl;
    cout << second << endl;
    cout << "*" << greeting << "*" << endl;
    cout << second << endl;
    cout << first << endl;
    cout <<"试一试"<<first+greeting+second<<endl;

    return 0;
}

eg：std::str(10,*);//-->str=十个*

        s+t直接就是两个字符串无缝衔接（不过好像有限制？

x op=y == x=xopy(op为算术运算符或者移位符）

size_t是无符号整数类型（确保在不同平台上对内存大小的表示方式是一致的，从而提高了代码的可移植性）

#include <algorithm>
#include <iostream>
#include <string>
#include <ios>
#include <iomanip>
#include <vector>

using namespace