1 / 18

Multi-Dimensional Arrays

Multi-Dimensional Arrays. CSCE 110. One dimension (which student). When To Use Arrays Of Different _______________. Determined by the data – the number ____________________ ___________ determines the number ______________ to use. Examples: (1D array) Tracking grades for a class

fordon
Download Presentation

Multi-Dimensional Arrays

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Multi-Dimensional Arrays CSCE 110

  2. One dimension (which student) When To Use Arrays Of Different _______________ • Determined by the data – the number ____________________ ___________ determines the number ______________ to use. • Examples: • (1D array) • Tracking grades for a class • Each cell contains the grade for a student i.e., grades[i] • There is _________________ that specifies which student’s grades are being accessed • (2D array) • Expanded grades program • Again there is ____________ that specifies which student’s grades are being accessed • The __________________ can be used to specify which lab assignment

  3. Student Lab grade When To Use Arrays Of Different Dimensions • (2D array continued)

  4. [1] [2] [3] [4] [5] Rows When To Use Arrays Of Different Dimensions • (2D array continued) • Notice that each row is merely a _________ A _________ is an array containing rows of _________ Columns [1] [2] [3] [4]

  5. Section (Z) Student (X = column) Lab Assignment (Y = row) When To Use Arrays Of Different Dimensions • (3D array – take the ________ but allow for multiple ______). • The _______________________ specifies which section grades are being tracked. • Note: • The standard approach for specifying the dimensions is to specify the row coordinate (Y) and then the column coordinate (X). • The size of a _________ must be the same for all elements along that _______ e.g., all ____ must be of the same ____

  6. Section 503 Section 502 Section 501 • Student 1 • Student 2 • Student 3 • … • Lab1 • Lab2 • Lab3 • Lab4 • Lab5 • Lab6 • Lab7 When To Use Arrays Of Different Dimensions

  7. Declaring Multi-Dimensional Arrays • Format: • (Two dimensional arrays) • Name : array [min..max, min..max] of type; • (Three dimensional arrays) • Name : array [min..max, min..max, min..max] of type; • Examples: • var johnFinances : array [1..3, 1..7] of real; • var cube : array [1..6, 1..6, 1..6] of char; _____ _______

  8. Declaring Multi-Dimensional Arrays As A Type • Format: • Type declaration • Type • name = array [min..max, min..max] of element type; • name = array [min..max, min..max, min..max] of element type; • Variable declaration • array name : Type name;

  9. Declaring Multi-Dimensional Arrays As A Type • Example: • Type declaration • Finances = array [1..3, 1..7] of real; • Cube = array [1..6, 1..6, 1..6] of char; • Variable declaration • var johnFinances : Finances; • var aCube : Cube;

  10. Accessing / Assigning Values To Elements • Format: • name [row][column] := value; • Example: • finances [1][1] := 4500; • writeln (finances[1][1]); • OR • finances [1, 1] := 4500; • writeln (finances[1, 1]);

  11. Multi-Dimensional Arrays And Input/Output • Arrays of ___________________ (including multi-dimensional _________________ arrays) cannot be passed as parameters to: read, readln, write, writeln. • Only ______________________ can be passed as parameters to these procedures.

  12. A Character-Based Grid • program gridExample (input, output); • const • MAX_ROWS = 4; • MAX_COLUMNS = 4; • NUM_COMBINATIONS = 10; • type • Grid = array[1..MAX_ROWS, 1..MAX_COLUMNS] of char;

  13. A Character-Based Grid (2) • function generateElement (temp : integer) : char; • var • anElement : char; • begin • case (temp) of • 1, 2, 3, 4, 5, 6 : • anElement := ' '; • 7, 8, 9: • anElement := '*'; • 10: • anElement := '.';

  14. A Character-Based Grid (3) • else {still in case statement} • begin • writeln('<< Error with the random # generator.>>'); • writeln('<< Value should be 1-',NUM_COMBINATIONS, • ' but random value is ', temp); • anElement := '!'; • end; • end; • generateElement := anElement; • end;

  15. A Character-Based Grid • procedure initialize (var aGrid : Grid); • var • r : integer; • c : integer; • temp : integer; • begin • for r := 1 to MAX_ROWS do • begin • for c := 1 to MAX_COLUMNS do • begin • temp := random(NUM_COMBINATIONS) + 1; • aGrid[r][c] := generateElement(temp); • end; • end; • end;

  16. A Character-Based Grid (5) • procedure display (aGrid : Grid); • var • row: integer; • column: integer; • begin • for row := 1 to MAX_ROWS do • begin • for column := 1 to MAX_COLUMNS do • begin • write(aGrid[row][column]); • end; • writeln; • end; • end;

  17. A Character-Based Grid (6) • procedure displayLines (aGrid : Grid); • var • row : integer; • column : integer; • begin • for row := 1 to MAX_ROWS do • begin • writeln(' - - - -'); • for column := 1 to MAX_COLUMNS do • begin • write('|', aGrid[row][column]); • end; • writeln('|'); • end; • writeln(' - - - -'); • end;

  18. A Character-Based Grid (7) • begin • var aGrid : Grid; • initialize(aGrid); • writeln('Displaying grid'); • writeln('==============='); • display(aGrid); • writeln; • writeln('Displaying grid with bounding lines'); • writeln('=========================='); • displayLines(aGrid); • end.

More Related