A segmentation fault

I have try the following code to judge prime:

const int N = 200000;
long prime[N] = {0};
long num_prime = 0;
int is_not_prime[N]={1,1};
void Prime_sort(void)
{
    for( long i = 2 ; i<N ; i++ )
    {
        if( !is_not_prime[i] )
        {
            prime[num_prime++] = i;
        }
        for( long j = 0; j<num_prime && i*prime[i]<N ; j++ )
        {
            is_not_prime[i*prime[j]] = 1;
        }   
    }   
}

But when I run it, it cause a segmentation fault! That fault I have never meet.And I searched Google,and it explain segmentation fault as follow:

A segmentation fault (often shortened to segfault) is a particular error condition that can occur during the operation of computer software. In short, a segmentation fault occurs when a program attempts to access a memory location that it is not allowed to access, or attempts to access a memory location in a way that is not allowed

But I don't know where cause this fault in my code.Please help me.