打印一个三角形（c++实现）

#include <iostream>

using namespace std;

void printTriangle(int size)
{
    if(size <= 0)
        return;
    int s = size;
    int maxcol = 1+2*(s-1);
    int midcol = maxcol/2+1;
    for ( int row = 0; row < s; row++ )
    {
        for ( int col = 0;col < maxcol; col++ )
        {
            if ( (col < midcol - 1) || ( col > (maxcol-midcol) ) )
                cout << " ";
            else
                cout << "*";
        }
        midcol--;
        cout << endl;
    }
}
int main()
{
    int i;
    while ( cin >> i )
       printTriangle( i );
    return 0;
}