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Following the structured program theorem, all programs are seen as composed of three control structures : "Sequence"; ordered statements or subroutines executed in sequence. "Selection"; one or a number of statements is executed depending on the state of the program. This is usually expressed with keywords such as if..then..else..endif.
There are three main categories of control structures: Sequence – Very boring. Simply do one instruction then the next and the next. Just do them in a given sequence or in the order listed. Most lines of code are this. Selection – This is where you select or choose between two or more flows. The choice is decided by asking some sort of question.
All languages have the first three categories of control structures (sequence, selection, and iteration). Most have the if then else structure (which belongs to the selection category) and the while structure (which belongs to the iteration category). After these two basic structures, there are usually language variations.
All languages have the first three categories of control structures (sequence, selection, and iteration). Most have the if then else structure (which belongs to the selection category) and the while structure (which belongs to the iteration category). After these two basic structures, there are usually language variations.
History. Theoretical foundation. The structured program theorem provides the theoretical basis of structured programming. It states that three ways of combining programs—sequencing, selection, and iteration—are sufficient to express any computable function.
There are three main categories of control structures: Sequence – Sequence is code that is the most familiar and easiest to read. The code is read in an a to z order. Think of reading a book. You read chapter to chapter in sequential order. <script> var a = 1; var b = 2; var c = 3; a = b; c = a; <script>
May 18, 2020 · All languages have the first three categories of control structures (sequence, selection, and iteration). Most have the if then else structure (which belongs to the selection category) and the while structure (which belongs to the iteration category). After these two basic structures there are usually language variations.
