Structured Programming
Bayani Gaba-gaba
Two programs do the same job. One is nine hundred lines in a single block, with a handful of variables that anything can change and a control flow that jumps forwards and backwards. The other is thirty named blocks of thirty lines, each one handed exactly what it needs and handing back exactly what it produced. Both work today. Only one of them can be changed next year by somebody who did not write it.
That difference is what this topic is about. The structured approach is not a language feature or a syntax rule; it is a way of building programs, and the specification names its parts precisely: modularised programming, clear and well documented interfaces made of local variables and parameters, and return values. This lesson describes each of those, explains the advantages the approach brings, and shows what the alternative actually looks like, because the advantages are hard to feel until you have seen the problem they solve.
Manufura
- Describe the structured approach to programming.
- Explain the advantages of the structured approach.
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Nazarin Darasi
Barka da kammala darasi akan Structured Programming. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- Which of these is NOT part of the structured approach as described in the specification? A. Clear, well documented interfaces B. Modularised programming C. Return values D. Using global variables to share data between modules Answer: D
- What is a module? A. A file that stores program data B. A self-contained part of a program that performs one identifiable task C. A variable that can be seen throughout a program D. A loop that repeats a fixed number of times Answer: B
- Which term does the specification say examinable material will use for both arguments and parameters? A. Argument B. Interface C. Parameter D. Variable Answer: C
- Why does the structured approach make errors easier to find? A. Programs written this way contain fewer statements B. A local variable can only have been changed inside its own module C. The compiler checks structured programs more thoroughly D. Structured programs run more slowly, so faults are visible Answer: B
- A module can be rewritten without affecting any of the code that calls it, provided that: A. It is called only once B. It contains no loops C. It uses only global variables D. Its interface is unchanged Answer: D
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