源程序：
#include <stdio.h>
#include <stdlib.h>
#define N 80
char s[N];
void fun(long int n)
{
int i = 0;
while (n > 0)
{
s[i] = n % 10 + '0';
n = n / 10;
i++;
}
s[i] = '\0';
}
void main()
{
long int n = 12345;
printf("***the origial data***\n");
printf("n=%ld",n);
fun(n);
printf("\n%s",s);
system("pause");
}
