What happens to an int if it's not initilized?

I found this question, and whenever I try to run it, it gives me an error that it could not compile because the variable r has not been initialized. This is the question....

int n=1; int k=2; int r;
if(k<r) {
  r=n;
}

"What is the value of each variable after the if statement?"

Thanks in advance!