CHAPTER 15 — More about Program Structure

Most big tasks can be divided into smaller sub-tasks. Programs that perform big tasks are written with many sub-programs that perform sub-tasks. Big programs need loops that repeat sections of code and need decisions to pick alternative sections. This chapter shows how to do this.

Chapter Topics:

Control Structures
Brackets that show what statements are controlled
IF-THEN-ELSE-END IF control structure
DO WHILE LOOP control structure
Example checking account program

QUESTION 1:

(Mental exercise:) A car is made up of many small components (motor, body, wheels, radio, fuzzy dice ...) which are in turn made up of even smaller components (block, head, cam shaft, gaskets, pistons, ...), which are made up of yet smaller components, and so on.

When a car is assembled out of its major components, is the order of assembly important?
Can some of the major components be assembled independently?
Are some of the components made in separate factories?
Does the order of assembly matter for each component?
Does this sound an awful lot like putting together a big computer program?