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Declaration of array in C programming

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  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
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