The following sections explain each of the three structured programming constructs. Read them carefully and you'll see that the concept of a structured program is easy to understand. Learning about structure before learning a language should help you think of structure as you develop your programming skills.
Sequence is nothing more than two or more instructions one after the other. Sequential instructions are the easiest of the three structured programming constructs because you can follow the program from the first statement to the last within the sequence. Figure 22.4 uses flowcharting to demonstrate sequence logic.