46.输入一个整数取出偶数位，并按照原来的顺序输出

#include<stdio.h>
unsigned long fun(unsigned long n)
{
unsigned long x = 0, s, i;int t;
s = n;
i = 1;
while (s != 0)
{
t = s % 10;
if (t % 2 == 0)
{
x = x + t*i;
i = i * 10;
}
s = s / 10;
}
//printf("%ld", x);
//getchar();
return x;
}

int main()
{
unsigned long n = -1;
while (n > 99999999 || n < 0)
{
printf("Please input(0<n<999999999):");
scanf_s("%ld",&n);
}
printf("%ld\n", n);
getchar();
printf("\nTheresult is:%ld\n", fun(n));
getchar();
return 0;

}