Introduction to Control Abstraction
A programming language for software engineering must provide a small but powerful set of control structures to describe the flow of execution with in a program unit. A language must provide primitives for the three basic structured programming constructs sequence, selection and repetition. There are however considerable variations both in the syntax and the semantics of the control structures found in modern programming languages.
Early programming languages such as FORTRAN in didn't provide a rich set of control structures. The programming used a set of low level control structures such as the unconditional branch or go to statement and the logical if to express the control flow within a program. There is now general agreement that higher level control abstractions must be provided and should consists of;
(a) Selection: Sequence is used to select whether a group of statement should be executed or not based on the value of same condition. Ada in common with most modern languages provides two basic selection constructs the first if statement. Provides one or one two way selection and the second the case statement provides a convenient multiday selection structure.
(b) Sequence: Sequence is used to group together a related set of program statements. This basic set of primitives fits in well with the top down philosophy of program design each primitive has a single entry point and a single exit point.
(c) Repetition: Repetition is used to repeatedly execute a group of statement. Control structures for repetition traditionally fall into two classes. Loop structures where the number of iterations is fixed and those where the number of iterations is controlled by the evaluation of some condition.
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