Some Principle of Structured Programming
As we have seen much that structured programming is an essential aspect of any of the programming languages. It basically makes our program in a form of a linear structure in which the execution of the statement of program starts form the beginning of the program and then it linearly flows through the program and executing the statement one by one in a sequence. Such feature makes an effective participation in every programming languages. If each of the languages do has such aspect it execution will be so easy.
So the main principle of the structured programming is to linearize the control flow through a computer program so that the execution sequence following the sequence in which the code has been written. This important principle makes to the following characteristics clear:
So this principle increases the readability of the code which eases understanding testing debugging documentation and modification of programs.
Including this main goal as our main principle there are some more principle that are used for the structured programming listed as:
(a) Standardization : It is always desirable to build software form components that all exhibit the same external interface. The simples tinted face comprises one entry point at the start and one exit point at the end. This has the strength of beings consistent with the essence of sequential programming. It also conforms with the important idea of calling a procedure. We consider the idea of calling a procedure as a sequential step and returning from it to the next instruction in sequence.
Other constructs that posses the same single entry at the start single exit at the end property are if then else and while do.
(b) Abreaction : Abstraction is probably the most important idea in structured programming. The human mind cannot devise or understand the whole of a complex system. It can only understand some part of the system. But it is required and essential to understand the whole system. So to resolve such problem abstraction is used. In abstraction the system must be described in a notation that allows subsystems to be see as black boxes whose task is readily understood but whose detail is invisible. In programming the procedure has long been a mechanism that fulfils this role.
(c)Expressive Power :As we have already seen in section 6.5, 2.2 that the go to statement has very less expressive power because one statement of go to may have 3-4 types of meanings. That why we require some mechanism for repetition and either a while statement or recursion are sufficient to provide this facility. Many languages provide both a while statement and a do while statement . most languages also support recursion.
(d) Orthogonality : When designing a set facilities a good design principle is to create features that are each as different from each other as possible. If this is so we can more easily satisfy the goal of a minimum number of functions while at the same time ensuring that the facilities are sufficiently powerful for all our needs.
(e) Minimality : When principle of minimality restricts our tend3ency to include too many facilities. So to follow the concept of minimality, three constructs given by Boehm Jacopini are the sufficient construct s to develop a structured program. There are other control structures that involve only three or less boxes but from amongst them all this three constructs set is the minimal set.
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