What is difference between array name and pointer to that array?

Answer:
Array name is constant pointer which points to base address of an array. While pointer to that array points to base address of that array.   
First difference:
(a)        Incrementing array name
(b)        void main(){
(c)            int arr[]={1,2,3,4};
(d)            arr++;
(e)            printf("%d",*arr);
(f)        }
(g)        Output:  Compilation error
(h)        (b)Incrementing pointer to array
(i)        void main(){
(j)            int arr[]={1,2,3,4};
(k)            int *ptr=arr;
(l)            ptr++;
(m)            printf("%d",*ptr);
(n)        }
(o)        Output: 2
(p)        Second difference:
(q)        void main(){
(r)            int arr[]={1,2,3,4};
(s)            int *ptr=arr;
(t)            printf("%d   %d",sizeof(arr),sizeof(ptr));
(u)        }
Output: 8  2
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