homework... sorry :o(

annoying/boring/newbie post - i'm sorry :o(

intro level student and i'm stuck on something that's probably laughable to all you experienced people... but it's driving me nuts and i can't be spending days on 1 question! so i'm just gonna post it and see if someone can possibly tell me what i'm doing wrong!

our class uses the website turingscraft for practice "homework questions" where a question pops up, you type in your answer, and it tells you if it's correct or incorrect, sometimes giving you hints.

this is the question:


Given an int variable n that has already been declared and initialized to a positive value, use a while loop to print a single line consisting of n asterisks. Use no variables other than n .

this is what i've typed..
while (n>0) {
System.out.println('*' * n);
n--;
}

i've also tried about a million variations, some of them being:
while (n>0) {
System.out.println('*');
n++;
}
and
while (n==n) {
System.out.println('*' * n);
n--;
}

it either tells me that i need to print a single line only, or it tells me i've sent it into an infinite loop... can *anyone* tell me what am i typing wrong? you will cause me much relief if so