Originally Posted by Graylord
MMO probably is out of your scope.
Just have an int that has current level, int that is max level, int for xp, and an int for xp until next level, with an optional max xp int.
Then, just check:
//Psuedocode compatible with most programming languages:
//code in here to get xp amount from an array using the current level as index.
if(currentlevel>0 and currentLevel<maxLevel)
do other things.
//Do some code here that displays xp progress on screen maybe.