Thread: Prime Prime Prime Help Help Help

hi everyone, i have being working on this code for a long time.. but couldnt make it right

it is simple find the prime number from the user inputs

this is the code ....

Code:

bool IsPrime(int iNum)
{
// Check if i is less than square root of iNum (and cast iNum to type double)
    for (int i=2; i<=sqrt((double)iNum); i++) 
    {
        if (iNum == ((int)iNum/i)*i)// (inum%i == 0)		
        return false;
    }
    return true;
}

but this is not the exact code that i want ...

my aim is to find the prime number that the user will input the max number,,,

example here:

input: 4
output will be: not prime..

please help ...... i know there are lot of related topic but .... still couldnt help.