Computer Science - 0478 CIE

Arrays

Bayani Gaba-gaba

Imagine storing the marks of 100 students in 100 separate variables, then trying to add them up. It would be unbearable. An array solves this by holding many values of the same type under a single name, each reachable by a number called its index, so a short loop can sweep through them all.

In this lesson you will learn to declare and use one-dimensional and two-dimensional arrays in the Cambridge pseudocode style, understand why arrays are so useful, and write values into and read values from an array using iteration, with full worked routines you can adapt in the exam.

Manufura

1 Declare and use one-dimensional (1D) and two-dimensional (2D) arrays
2 Understand the use of arrays
3 Write values into, and read values from, an array using iteration

Takardar Darasi

Almost every real program handles lists of data: scores, names, prices, pixels. Arrays are the basic structure for storing such lists, and the programming paper expects you to declare them, put data in, take data out, and process them with loops. Master the array-and-loop pattern and a whole class of problems becomes routine.

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Nazarin Darasi

Barka da kammala darasi akan Arrays. 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.

What must be true of all the items stored in one array? A. they must be integers B. they must be the same data type C. they must be strings D. they must be unique Answer: B
What is used to identify the position of an element in an array? A. its value B. its data type C. its index D. its identifier Answer: C
Which declaration creates a 1D array of 8 integers indexed 1 to 8? A. DECLARE A : INTEGER B. DECLARE A : ARRAY[1:8] OF INTEGER C. DECLARE A : ARRAY OF 8 D. DECLARE A[8] Answer: B
Which loop structure is normally used to process every element of a 2D array? A. a single WHILE loop B. a REPEAT loop C. a nested (loop inside a loop) D. no loop is needed Answer: C
Before adding all elements of an array into a variable Total, Total should first be: A. set to the first element B. set to 0 C. left undeclared D. set to the array length Answer: B