20171111 输入字符

给定一个字符，用它构造一个对角线长5个字符，倾斜放置的菱形.

样例输入
*
样例输出
  *
 ***
*****
 ***
  *

#include "iostream"  
using namespace std;  
int main()  
{  
    char a;  
    cin>>a;  
    cout<<"  "<<a<<endl;  
    cout<<" "<<a<<a<<a<<endl;  
    cout<<a<<a<<a<<a<<a<<endl;  
    cout<<" "<<a<<a<<a<<endl;  
    cout<<"  "<<a<<endl;  
    return 0;  
}