A Sequence that Counts

Look at this program fragment. Click inside the program to see how it works.

int count = 0;                  // statement 1
System.out.println( count ) ;   // statement 2

count = count + 1;              // statement 3
System.out.println( count ) ;   // statement 4

Here is how the program works:

1. Statement 1 puts 0 into count.
2. Statement 2 writes out the 0 in count.
3. Statement 3 first gets the 0 from count, adds 1 to it, and puts the result back in count.
4. Statement 4 writes out the 1 that is now in count.

When the fragment runs, it writes:

0
1