Chapter 3, Problem 42STE

What is the bug in the following code? What do you call this kind of loop bug?

$\begin{array}{l}\text{int n, sum}=0\text{;}\\ \text{for (n}=1\text{; n}<10\text{; n}++\text{)}\\ \text{sum}=\text{sum }+\text{ n;}\\ \text{System}\text{.out}\text{.println ("}1+2+\mathrm{...}+9+10=="+\text{ sum);}\end{array}$