Analyze the following code:

```
boolean even = false;
if (even = true) {
System.out.println("It is even");
}
```
a. The program has a compile error.
b. The program has a runtime error.
c. The program runs fine, but displays nothing.
d. The program runs fine and displays It is even.

d. The program runs fine and displays It is even.
It is a common mistake to use the = operator in the condition test. What happens is that true is assigned to even when you write even = true. So even is true. The program compiles and runs fine and displays "It is even".