逆转一个整数

 1 //逆转一个整数,如123->321
 2 #include<stdio.h>
 3 #include<stdlib.h>
 4 
 5 int main(int argc, char *argv[])
 6 {
 7     int ival;
 8     int sum;
 9     while(printf("input the number:\n"),scanf_s("%d",&ival) == 1)
10     {
11         sum = 0;
12         while(ival)
13         {
14             sum = sum * 10 + ival % 10;
15             ival /= 10;
16         }
17         printf("The reverse number is:%d\n",sum);
18     }
19     system("pause");
20     return 0;
21 }