New to Java

I need to check to see how many leap years are between two user-inputted years and I can't use date objects. I figure I need to start with a for loop, but I get lost when to by the mod 4, mod 100, or mod 400. Any help?

for(int l=cYear; l <= eYear; l++){
				if(l%4 == 0){
					if(l%100 == 0){
						
					}
				}
				
			}

also, if anyone is bored and really wants to give of themselves, I could use some more help with a pretty challenging-for-my-level program. Let me know.

Message was edited by:
kaluga