程序代码：

#include <stdio.h>
#include <math.h>
long f(long n)
{
    long m = fabs(n),y=0;
    while(m%10 != 0)
    {
        y = y*10+m%10;
        m = m/10;
    }
    return n<0?-y:y;
}
void main()
{
    printf("%ld\t",f(12345));
    printf("%ld\n",f(-34567));
}