the next palindrome - wrong answer

I guess my code is correct as it is giving correct answers for most cases. Can anyone point out any mistakes?

code:

 #include<iostream>
  using namespace std;

int digits(int a)
{
	int d=0;
	while(a!=0)
	{
		a=a/10;
		d++;
	}
	return d;
}

int sepa(int a)
{
	int d=digits(a);
	if(d%2==0)
	{
		d=d/2;
	}
	else{
		d=(d-1)/2;
	}
	while(d!=0)
	{
		a=a/10;
		d--;
	}
	return a;
}

int rev(int a)
{
	int r;
	int t;
	int d=digits(a);
	while(d!=0)
	{
		
		r = r*10;
		r += a%10;
		a=a/10;
		d--;
	}
	return r;
}

int pali(int a)
{
	int d=digits(a);
	d=d/2;
	int t = sepa(a);
	if(digits(a)%2!=0)
	{
		t=t/10;
		t=t*10;
	}
	while(d!=0)
	{
		t=t*10;
		d--;
	}
	d = t + rev(sepa(a));
	return d;
}
int main()
{
	int c,d,tc;
	cin>>tc;
	while(tc!=0)
	{
	cin>>c;
	d=pali(c);
	while(c>=d)
	{
		int t=sepa(d)+1;
		int r=digits(d)/2;
		while(r!=0)
		{
			t=t*10;
			r--;
		}
		d=pali(t);	
	}
	cout<<d<<endl;
	tc--;
	}
	return 0;
	
}
//