摘要： #include<iostream>#include<set>using namespace std;void up_and_down(int i){cout<<i<<" "<<&i<<endl;if(i<4)up_and_down(i+1);cout<<i<<" "<<&i<<endl;}int main(){up_and_down(1);return 0;}运行结果如下：首先， main() 使用参数 1 调用 阅读全文