using C++ to determine if a no. is prime or not

[kolnit]

i wanna use C++ to determine whether a no. is prime or not...
but the thing just doesnt work at all...
would anyone kindly check this for me??
Thanks a lot!

#include "stdafx.h"
#include <iostream>
#include <cmath>
using namespace std;
 
//To determine whether a given number is prime or not
 
void main()
{ 
    int N;int count;
    cin >> N;
    int k;
    for (k=2;k<N;k+1)
    if (N%k==0)
    {cout << k;
     cout << N/k;
                 cout << count;}
                 if (count==0)
                 cout << " <<N<<"is a prime number."
}
 

Actually I dont udnerstand that "count" thing..
my teacher told me to include this,but i dont know if it is a default function or not.

[RRick]

The count variable looks like the teacher wants to know how many factors are in the number. In any case, count has to be initialized to 0 before the loop.

Also, take the if ( count == 0) logic out of the loop and place it after the loop. That fix should print the correct message for prime numbers.