C++:
```cpp
include using namespace std; int main() { int n; cin >> n; int m = (n % 10) * 100 + (n / 10 % 10) * 10 + n / 100; cout<< m << endl; return 0; } ``` Java: ```java import java.util.Scanner; public class ReverseThreeDigitNumber { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("请输入一个三位数: "); int number = scanner.nextInt(); if (number >= 100 && number <= 999) { int reversedNumber = (number % 10) * 100 + (number / 10 % 10) * 10 + number / 100; System.out.println("反向输出的结果是: " + reversedNumber); } else { System.out.println("输入的数字有误,请输入一个三位数的整数"); } } } ``` Python: ```python def reverse_three_digit_number(num): if 100 <= num <= 999: reversed_num = str(num)[::-1] return int(reversed_num) else: return "请输入一个三位数" user_input = int(input("请输入一个三位数: ")) result = reverse_three_digit_number(user_input) print(f"反向输出的结果是: {result}") ``` C: ```c include int main() { int n; scanf("%d", &n); int m = (n % 10) * 100 + (n / 10 % 10) * 10 + n / 100; printf("%03d\n", m); return 0; } ``` 这些代码示例都展示了如何反转一个三位数。你可以根据自己的编程语言选择合适的代码进行实现。