Data Structures
Gbogbo ọrọ náà
Write a program that stores one exam mark and you need one variable. Write one that stores thirty and you do not need thirty variables, because thirty variables cannot be looped over, cannot be sorted, and cannot be passed to a subroutine in one piece. What you need is a single name that holds all thirty and a number that says which one you mean. That is an array, and it is the reason the loop you met earlier in this course is useful at all.
This lesson covers the concept of a data structure and the two the specification names: arrays, in one and two dimensions, and records. Arrays hold many things of the same kind under one name; records hold several different things about one subject. You will learn to use each of them in the design of solutions to simple problems, to combine them into an array of records, and to say why a particular structure suits a particular problem, which is the form the exam question takes.
Ebumnobi
- Understand the concept of data structures.
- Use arrays (or equivalent) in the design of solutions to simple problems.
- Use records (or equivalent) in the design of solutions to simple problems.
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
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Akwụkwọ Ọmụmụ
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Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Data Structures. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- An array holds 15 items. What is the index of the last item? A. 0 B. 14 C. 15 D. 16 Answer: B
- Which statement about an array is correct? A. Its items may have different data types B. Its items are reached by a field name C. All of its items have the same data type D. It can only hold numbers Answer: C
- A two dimensional array Grid has 6 rows and 9 columns. How many elements does it have? A. 15 B. 45 C. 54 D. 69 Answer: C
- Which structure is most appropriate for storing a name, an age and a Boolean about one person? A. A one dimensional array B. A two dimensional array C. A record D. A string Answer: C
- In a one dimensional array holding a grid of width 5, which expression gives the index of the element in row 3, column 2? A. 3 + 2 B. 3 * 5 + 2 C. 3 * 2 + 5 D. 5 * 2 + 3 Answer: B
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Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Data Structures? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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