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阅读程序写结果：
#include <iostream>
using namespace std;
int main() {
int a[6] = {1, 2, 3, 4, 5, 6};
int pi = 0;
int pj = 5;
int t, i;
while (pi < pj) {
t = a[pi];
a[pi] = a[pj];
a[pj] = t;
pi++;
pj--;
}
for (i = 0; i < 6; i++)
cout << a[i] << ",";
cout << endl;
return 0;
}输出：____
