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# Simple Array, 2D Array, Multidimensional Array

Posted By: Ryan Evans     Category: C Programming     Views: 40347

-  It’s a group of related data items that share a common name
-  Index number or subscript to differentiate the data items
-  Individual items are called elements
-  Arrays can be of any variable type
-  Ex. int roll_no [10]

### One Dimensional Arrays

• A single subscripted variable is called one dimensional array
• In C x[5] represents the same concept as in mathematics X5
• To represent a set of five scores (75,12,33, 105, 67) by Tendulkar, we may define as follows, int Ten_scores[5];
• Ten_scores[0] = 75 …

### Elements

• Space is reserved for each element as usual
• Each element is treated as an individual variable
• C provides no bound checking for array indices!
• The subscript of an array can be an integer constant, integer variables, or an expression which yields integer value

### Declaration of Arrays

•  type_of_element    name_of_array[size]
•  int amount[5], float marks[30] etc
•  char name[10] can actually have only 9 characters in it!
•  int ten_scores[5] = {75,12,33, 105, 67} initializes the array with respective values
•  If lesser items are specified in the init list, other elements will have zeroes

### Need For Static

• Automatic arrays can not be initialized in K&R C, ANSI C allows that
• In K&R C one need to have static arrays to initialize it
• So if we write static word before initialization, it can work with old K&R compiler as well!

### Other Issues for Initialization

• The size may be omitted at the time of initialization like int no[]={2,4,7,4,6,9}
• char name[]={‘S’,’y’,’n’,’t’,’a’,’x’} can also be written as
• char name[]=“Syntax”
• In C there is  no convenient way to initialize specified elements
• No shortcut for large no of elements

### Two Dimensional Arrays

 Item1 Item2 Item3 SalesMan1 234 5876 4985 SalesMan2 123 4756 5869 SalesMan3 125 5964 5695 SalesMan4 241 5896 9876

### Defining 2D Arrays

•  type array_name [size1] [size2]
•  int sales[4] [3] in above case
•  As with single dimension arrays, each dimension of an array is indexed from 0 to 1- maximum size
•  The first index indicates row and the second index indicates column

### Representation Of 2D Arrays

 Column0 Column1 Column2 [0][0] [0][1] [0][2] Row0 234 5876 4985 [1][0] [1][1] [1][2] Row1 123 4756 5869 [2][0] [2][1] [2][2] Row2 125 5964 5695 [3][0] [3][1] [3][2] Row3 241 5896 9876

### Initializing 2D Arrays

•  static int table[2,3] = {1,3,5,7,9,2}
•  static int table[2,3] = {{1,3,5}, {7,9,2}}
•  static int table[2,3] = {{1,3,5}, {7,9,2}}
•  Missing will initialized to zeros in static int[2,3] = { {1},{2,3} }
•  Static int m[5] = {{0},{0},{0}} for all zeros

### Multidimensional Arrays

• C allows arrays of more than two dimensions.
• Exact limit is determined by the compiler
• Size is more imp than the no of dimensions
• Survey of rainfall of last 3 years of all 12 months of five cities: int survey [3][12][5]
• View multidimensional arrays as repeated 2D arrays

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 Ryan Evans author of Simple Array, 2D Array, Multidimensional Array is from London, United Kingdom. View All Articles

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