The program worked, in the sense that it accepted 2 and 3, and returned 5. But it still has problems. These
are described on Problem Report forms, like the one shown in Figure 1.3.
1. Design Error: Nothing shows you what program this is. How do you know you're in the right
program?
2. Design Error: There are no onscreen instructions. How do you know what to do? What if you enter
a wrong number? Instructions could easily be displayed OD the screen where they won't be lost, as
short printed instructions typically are.
3. Design Error: How do you stop the program? These instructions should appear onscreen too.
4. Coding Error: The sum (5) isn't lined up with the other displayed numbers.
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