求助啊

#include<stdio.h>
int main()
{
	int n = 0;
	scanf("%d", &n);
	int k = 0;
	int num = 0;
	if (n > 0)
	{
		while (n > 0)
		{
			k = n % 10;
			n = n / 10;
			num = num * 10 + k;
		}
		printf("%d", num);
	}
	if (n < 0)
	{
		n = n * -1;
		while (n > 0)
		{
			k = n % 10;
			n = n / 10;
			num = num * 10 + k;
		}
		printf("%d", -num);
	}
	return 0;
}