Accelerated C++ (二)

Eddy 发布于2010-1-2 11:8:13 分类: 程序设计已浏览loading次网友评论0条 我要评论

输出如下字符图形：

****************
* *
* Hello, Eddy! *
* *
****************

源代码：

#include <iostream>
#include <string>
using namespace std;
int main()
{
//ask for the person's name
cout<<"Please input your first name: ";

//read the name
string name;
cin>>name;
//build the message that we intend to write
const string greeting = "Hello, " + name + "!";
//the number of blanks surrounding the greeting
const int pad = 5;

//the number of rows and columns to write
const int rows = pad * 2 +3;
const string::size_type cols = greeting.size() + pad * 2 +2;

//write a blank line to separate the output from the input
cout<<endl;
//write rows rows of output
//invariant:we have written r rows so far
for (int r = 0; r != rows; ++r)
{
  string::size_type c = 0;
  //invariant:we have written c characters so for in then couurent row
  while (c != cols)
  {
   //is it time to write greeting?
   if (r == pad + 1 && c == pad + 1)
   {
    cout<<greeting;
    c += greeting.size();
   }
   else
   {
    //are we on the border?
    if (r == 0 || r == rows - 1 || c == 0 || c == cols - 1)
    {
     cout<<"*";
     c++;
    }
    else
    {
     cout<<" ";
     c++;
    }
   }
  }
  cout<<endl;
}
return 0;
}