Accelerated C++學習筆記 Ch2

/* ----------------------------------------------------- *
	Ch2 循環與計數
	說明：引用書中代碼，略有改動
 * ----------------------------------------------------- */

#include <iostream>

using namespace std;

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

	const string greeting = "Hello,"+name+"!" ;
	const int pad = 2;//1
	const int rows = 3 + 2 * pad;
	const string::size_type cols = 2 + greeting.size() + pad * 2; // 注意類型

	string::size_type c=0; // 把定義放在了循環外
	for(int r=0;r!=rows;r++) // 1 用r!=rows而不用r<rows固定結束條件 2 在for循環中定義
	{
	    c=0;// 一行開始注意清零，寫循環時注意下次執行循環是否仍正確
		while(c!=cols)
		{
			if(r==pad+1&&c==pad+1)
			{
				cout<<greeting;
				c+=greeting.size()-1;// 注意保持數據的含義，這裏書中有點小毛病，減去1就行了
			}
			else
			{
                if(r==0||r==rows-1 ||
                    c==0||c==cols-1)
                    cout<<"*";
                else
                    cout<<" ";
			}
			c++;
		}
		cout<<endl;
	}
	cout<<"end"<<endl;
    return 0;
}
/* ----------------------------------------------------- *
Please enter your name:Tom

****************
*              *
*              *
*  Hello,Tom!  *
*              *
*              *
****************
end

Process returned 0 (0x0)   execution time : 4.970 s
Press any key to continue.
 * ----------------------------------------------------- */