Declaration of array in C programming

  Syntax:

     storage_class   data_type   array_name[expression];

          Where, storage_class refers to the storage class of the array. It may be auto, 

                             static, extern. But it is optional.

         data_type is the data type of array. It may be int, float, char, ….etc. If int is

                          used, this means that this array stores data items of integer types.

          array_name is name of the array. It is user defined name for array.

          [] represents the array and expression inside this may be integer constant like    

                 10, 100 or Symbolic constant like SIZE (i.e. #define SIZE 80, this can be   

                 used as int a[size];). This expression represents the number of elements in                      

                 array.

Example:

      int a [5];

           It tells to the compiler that ‘a’ is an integer type of array and can store 5 integers. The compiler reserves 2 bytes of memory for each integer array element.

It’s individual elements are recognized by a[0], a[1],a[2],a[3] and a[4]. The integer value inside [] is called index of array. Index always starts from 0 and ends with one less than size of array.

 Similarly, long num[5]; char ch[10]; are another examples of array declarations