Pointer vs Array in C
Most of the time, pointer and array accesses can be treated as acting the same, the major exceptions being:
1) the sizeof operator
o sizeof(array) returns the amount of memory used by all elements in array
o sizeof(pointer) only returns the amount of memory used by the pointer variable itself
2) the & operator
o array is an alias for &array and returns the address of the first element in array
o &pointer returns the address of pointer
3) a string literal initialization of a character array
o char array = “abc” sets the first four elements in array to ‘a’, ‘b’, ‘c’, and ‘\0’
o char *pointer = “abc” sets pointer to the address of the “abc” string (which may be stored in read-only memory and thus unchangeable)
4) Pointer variable can be assigned a value whereas array variable cannot be.
int a; int *p; p=a; /*legal*/ a=p; /*illegal*/
5) Arithmetic on pointer variable is allowed.
p++; /*Legal*/ a++; /*illegal*/
6) Array is a collection of similar data types while pointer variable stores the address of another variable.
Please refer Difference between pointer and array in C? for more details.