why arrey is used?

An Array is used for the following benefits- 1. It is used to represent multiple data items of same type by using only single name. 2. It can be used to implement other data structures like linked lists, stacks, queues, trees, graphs etc. 3. 2D arrays are used to represent matrices. We also should know its disadvantages which are given below - 1. We must know in advance that how many elements are to be stored in array. 2. Array is static structure. It means that array is of fixed size. The memory which is allocated to array can not be increased or reduced. 3. Since array is of fixed size, if we allocate more memory than requirement then the memory space will be wasted. And if we allocate less memory than requirement, then it will create problem. 4. The elements of array are stored in consecutive memory locations. So insertions and deletions are very difficult and time consuming. read less

Generally if we want to store any single value - then we will use one 'Variable' to store. Example _ if you want to store a value 10 of type integer - then you have to store in 'int var=10;' - But if we want to store one or more than one value in the same variable then we have to use array.It means, if you want to store one or more values of similar type (int type or float type or double type .... etc) in one single variable, then it is possible by using arrays(array variable). Example - if you want to store values 10, 20 of type integers in single variable then you can store as follows : int var[] = {10,20}; here variable is an array of type int which hold two values that is 10,20 and those are stored in the same variable by index var[0] holds 10 and var[1] holds 20. ==================================================================== you can store values in array in two ways. 1. Inline (Storing values at the same time during declaration). - The good example for inline initialization is the above example. 2. Initialization (Storing values in future). - it means you can store values in array when ever we need. Example is as follows : Example Initialization : int a[] = new int[3]; - here the size of an array is 3, index will always starts from zero. and you can store values of type int (10, 20 , 30) as follows : a[0] = 10; a[1] = 20; a[2] = 30; The Limitation of array is - once you mention the size then it is fixed. It means once if you give the size of an array then you can store the values in that particular array only upto the size. In the above example the array variable 'a' can have only 3 values. if you add one more value even by mistake i.e) a[3]=40; then it won't show any error at the time of compilation. But it throws Exception during Run time (Exception Name:- Array Index out of Bound). =========================================================================================================================== If you want to store array of arrays then you will go for double dimension arrays. example :- int i={2,3,4} and int j={5,6,7} you can store both i and j in one varible as follows : int var[][] = {i, j} - In this case var is of size 2 arrays, and var[0] is first array and var[1] is second array if you want to see the values from first array which has 3 values then - var[0][0] = 2 var[0][1] = 3 var[0][2] = 4 if you want to see the values from Second array which has 3 values then - var[1][0] = 5 var[1][1] = 6 var[1][2] = 7 ---------------------------------------------------------------------------------------------------------------------- In two dimention array you can store values of multidimention arrays also Example :- int m={2,3} and int n={5,6,7} here 'm' array is of size 2 and 'n' array is of size 3. you can store those two different size arrays in variable as int var[][] = {n, m} In this case var is of size 2 arrays (var.length) and var[0] is first array and it's length is 2 and var[1] is second array and it's length is 3 if you want to see the values from first array which has 2 values then - var[0][0] = 2 var[0][1] = 3 and if you want to see the values from second array which has 3 values then - var[1][0] = 5 var[1][1] = 6 var[1][2] = 7 ----------------------- read less

Array you can think of as a structure to hold collection of similar objects. Say array of integers, strings,etc. Array provide good visualization of computer memory as the memory is usually allocated in contagious manner. So its very useful in system programming. In system, Usually there is array of a segment which you can accesss with the help of pointers in C or C++. read less

An array is data structure (type of memory layout) that stores a collection of individual values that are of the same data type. Arrays are useful because instead of having to separately store related information in different variables (named memory locations), you can store them—as a collection—in just one variable. It is more efficient for a program to access and process the information in an array, than it is to deal with many separate variables. read less

C programming language provides a data structure called the array, which can store a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type. Instead of declaring individual variables, such as number0, number1, ..., and number99, you declare one array variable such as numbers and use numbers[0], numbers[1], and ..., numbers[99] to represent individual variables. A specific element in an array is accessed by an index. All arrays consist of contiguous memory locations. The lowest address corresponds to the first element and the highest address to the last element. read less