Question

一道c语言题目。。。。。

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
int num;
int a, b, c;
srand((unsigned)time(NULL));
num = rand() % 1000; //随机产生一个三位数 num
a = num / 100; //取得随机数的百位
b = num / 10 % 10; //取得随机数的十位
c = num % 10; //取得随机数的个位
num = c * 100 + b * 10 + a; //将随机数反序（个位和百位互换）
printf("%d\n",num); //输出反序后的随机数
return 0;
}

Answer 2

int new_num = 0;
while (n)
{
new_num = new_num * 10 + n % 10;
n = n / 10;

}

Answer 3

x = rand()%1000;
a = x / 100;
b = (x % 100) / 10;
c = (x % 100) % 10;
y = c * 100 + b * 10 + a;