if...

yesh, that's what it is, lol... ok so..uhm, tell me if this is right?
if digital_io_out18 = 115;
then..uhm...? lol sorry i'm not THE greatest with C...
hmm..see i was looking through trying to find a list of acceptable codes in C for robotics but i coudn't seem to find a list so I'm tryin' to figure it out...but you can use then statements..correct..?
Thanks