阅读程序写结果：

1#include <iostream>2using namespace std;3 4int main(){5	int a[6] = {1, 2, 3, 4, 5, 6};6	int pi = 0;7	int pj = 5;8	int t, i;9	while (pi < pj)10	{11		t = a[pi];12		a[pi] = a[pj];13		a[pj] = t;14		pi++;15		pj--;16	}17	for (i = 0; i < 6; i++)18		cout << a[i] << ",";19	cout << endl;20	return 0;21}

输出：____