Every time you visit for the FIRST TIME today... [Part 1]

Post a random function that you made. May be from any project you've done or make one impromptu.

Any QUALITY is allowed. No bullying!

[/code]int isprime(long long int n)
{
long long i, sqrt_n;

/* If even number */
if ((n % 2 == 0) || n <= 1)
return 0;

sqrt_n = sqrt(n);
/* Skip every 2nd number to avoid even numbers
to reduce the number of loops */
for (i = 3; i <= sqrt_n; i += 2) {
if (n % i == 0)
return 0;
}

return 1;
}[/code]