Array Rotation :Write a function rotate(ar[], d, n) that rotates arr[] of size n by d elements.(left)

ArrayRotate.txt

Input arr[] = [1, 2, 3, 4, 5, 6, 7],
d = 2, n =7
Ans:arr[] = [3, 4, 5, 6, 7, 1, 2]

solution: (Ar Br)r
steps:
first reverse d elements
then reverse remaining (n-d) elements
now reverse entire elements.
Example:
d=3,total elements=10
   1 2 3 4 5 6 7 8 9 10
=> 3 2 1 4 5 6 7 8 9 10
=> 3 2 1 10 9 8 7 6 5 4
=> 4 5 6 7 8 9 10 1 2 3  
Done

http://www.geeksforgeeks.org/array-rotation/