Experience system...

[Torankusu_2002]

I'm debating whether or not i want to start woring on an experience system. I pretty much know how I want it laid out, and how to go about doing it, but I have a few questions regarding "short cuts."

Okay, on GK for example, when get to a certain level, you need x amount of exp to level up. Does this have to be done by something like
"if (theexperience>=thenumberblah) {
the level goes up one;
}"
for every individual level, or could I use something mathematical?
I don't want to have to go and add all of the codes manually, but I was wondering if there was a set or a few lines that I could make it with to determine when the player needs to level up.