指针：交换一组数据

#include"iostream"using namespace std;const int N = 8;int main(){int a[N], *p, *q;for (p = a; p < a + N; p++)cin >> *p;p = a;q = a + N - 1;while (p < q){int r = *p;*p = *q;*q = r;         // 交换！p++;q--;}for (p = a; p < a + N; p++)cout << *p << ' ';cout << endl;system("pause");return 0;}