2-4.cpp

Accelerted cpp 第二章答案 第二部分 一本很好的cpp入门书

#include<iostream>
#include<string>

using std::endl;using std::string;
using std::cin; using std::cout;

int main()
{
cout<<"Please enter your name:";
string name;
cin>>name;
cout<<endl;

const string greeting = "Hello," + name + '!';//问候语字符串
const string space(greeting.size(),' ');//空行的空格字符数

const int pad = 1;//为主问候语的空白处

const int rows = pad * 2 + 3;//输出的行数

const string::size_type col = greeting.size() + pad * 2 + 2;
cout<<endl;//输出空行隔开 

for(int r = 0;r != rows;r++){

string::size_type c = 0;

while (c != col){
	if(r == pad + 1 && c == pad + 1){
	cout<<greeting;
	c += greeting.size();
	} else { 
		if (c == 0 || r == 0 || c == col - 1 || r == rows - 1)
			cout<<'*';
      		else if(r == 1 && c == 2 || r == 3 && c == 2) {
			     cout<<space;
			     c = space.size();
			     }//一次性输出空行的空格数
			     else 
			     cout << ' ';
		++c;
		}
	}
       	cout<<endl;
  }
return 0;
}