这样写的C++代码为什么不可以？

#include<iostream>
using namespace std;
int zhiSu(int);
int huiWen(int);
int main()
{
	int a, b;
	cin >> a >> b;
	for (int i = a; i <= b; i++)
		if (zhiSu(i) == 0 && huiWen(i) == 0)
			cout << i << endl;
	system("pause");
	return 0;
}
int zhiSu(int x)
{
	int t = -1;
	for (int i = 1; i <= x / 2 + 1; i++)
		if (x%i == 0)
			t++;
	if (t == 0)
		return 0;
	else
		return 1;
}
int huiWen(int x)
{
	int a = x, y = 0;
	for (;a!=0;)
	{
		y = y * 10 + a % 10;
		a /= 10;
	}
	if (x == y)
		return 0;
	else return 1;
}
```求大佬指教