取奇数

#include <stdio.h>
void fun(unsigned long *n) {
unsigned long x = 0, i;
int t;
i = 1;
while (*n)
/**********found**********/
{
t = *n % 10;//取个位
/**********found**********/
if (t % 2 != 0) {//如果为奇数
x = x + t * i;//加到末尾
i = i * 10;//位数往前移
}
*n = *n / 10;//减掉一位
}
/**********found**********/
*n = x;
}
int main(void) {
unsigned long n = -1;
while (n > 99999999 || n < 0) {
printf("Please input(0<n<100000000): ");
scanf("%ld", &n);
}
fun(&n);
printf("\nThe result is: %ld\n", n);
}