Array is a structure storing elements of similar data types sequentially in memory.
Subscript Array is a structure storing elements of similar data types sequentially in memory (Index) is a variable through which the elements of the array are processed.
Array size is maximum number of elements an array can hold.
Rules for Arrays:-
- An array must be declared before it is used.
- An array name has the same rules applicable to it that are defined for variable names.
- An array name cannot be the same as an existing variable name or constant name.
- Array size specified in the declaration statement must be a positive integer value or a constant containing a positive integer value.
- It is invalid to assign an array to another by using the assignment operator. For example, If num and num2 are  arrays, it is invalid to write num2 = num.
Types of Arrays:-
- Single dimension (eg:Â int rollno[3] = {1,2,3}; )
Single dimensional arrays can have only one dimension and are visually represented as having several rows but a single column of data.
- Multi dimension ( eg: int matrix_num[4][2];Â )
Multidimensional arrays can have more than one dimension although more than two or three are rarely used. They may consist of several rows and columns, as well as multiple dimensions.
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Sorting:-Â Sorting is the process of ordering the elements in a proper order. Order can be ascending or descending, depending on the requirement.
- The process of arranging the elements of an array in a particular order is called sorting.
- The elements can be sorted either in ascending order or descending order, depending on the requirements.
- Two of the most commonly used sorting methods are bubble sort and selection sort.
- Bubble sort is the simplest and relatively slowest of all the other techniques of sorting.
Bubble sort is one of the most commonly used sorting techniques.