Let you teach what is difference between pointer and array. Firs of all we should know the definition of pointer and array.
Pointer is a variable that capable of storing the address
Array is collection of same elements
Difference between Pointer and Array:
Array size is fixed and can't be expand at run time. Pointer can be expand at run time using the malloc function.
Pointer memory is allocated using this code:
size defines bytes required for the pointer.
consider this eg:
ptr=(int *)malloc(sizeof(int)*10);//allocates 20 bytes(2byte for int).
ptr=realloc(20,40);//reallocates the memory to 40 bytes.