#include <iostream> using namespace std; int main() { int a; cout << "请输入一个四位数: " << endl; cin >> a; if (a >= 1000 && a <= 9999) { int thousand = a / 1000; int hundred = (a / 100) % 10; int ten = (a / 10) % 10; int one = a % 10; int result = one * 1000 + thousand * 100 + hundred * 10 + ten; cout << result << endl; } else{ cout << "输入的不是四位数，请重新运行程序并输入正确的数字。" << endl; } return 0; }