How do I access variable outside the loop?

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mathematics

C++98

#include<iostream>
using namespace std;
int fact(int n)
{
   int i=5;
   int c=n/i;
   while(c!=0)
   {
    i=i*i;
    c+=n/i;
    return c;
   }
   return 0; 
}
int main(){
    long t;
    unsigned int a[100001],x[100001];
    cin>>t;
    for(int i=0;i<t;i++)
    {
        cin>>a[i];
        int c=a[i];
        x[i]=fact(c);
    }
    for(int i=0;i<t;i++)
    {
    cout<<x[i]<<endl;
    }
}

The problem is to print the trailing zeroes in the factorial of a set of numbers and the numbers could be upto 100000. But I seem to get an incorrect answer for numbers with 4 digits or above.

What I have tried:

I tried simply putting the return c statement outside the loop but that makes the code go into infinite loop.