#include <stdio.h>
int fanzhuan(int a)
{
	int n,k,i;
	while(a!=0)
	{
		n = a % 10;
		k = k * 10 + n;
		a /= 10 ;
	}
	printf("%d",k);
 } 
int main()
{
	int a;
	scanf("%d",&a);
	if (a>0)
		fanzhuan(a);
	else if (a<0)
	{
		printf("-");
		a = - a;
		fanzhuan(a);
	}
	else
		printf("0");
return 0;
}

请问这边哪里出错了，没全对