very interesting... i am not an expert but "cout" in "c" ... i am little doubtfull. ... may be something called "c plus plus" "c++" ..  but definitely  not c.......

but once again what do i knoe (O:
if i recall correctly....
set(w) does nothing more than aligning the width.. i.e. to the  integer of length (w)

so ...
based on your initializing you are filling up the array called arr with elements
arr[0]=3
arr[1]=4
arr[2]=5
arr[3]=6

so the first display will show
3 4 5 6 [ with 4 spaces between each one of them]then
6 5 4 3 [ with 4 spaces between each of them ]

actually... (2) is very easy if you think about it...

for (i=0; i<=5; i++)
   cout <<setw(4) << arr[2*i];


i will leave tech_guy to do that rest of the work.. ... this is tiring (O:

===============================
as always
what do i know (O:

Thanks man.. Yea I mean C++..My bad... Where is Tech Guy ?? I gotta buzz him...rite on...thnx dude///

techguy..where@??

  ey Techguy Bro,
Thnx for the post. Can you do me one more of a favor? I need this done man and I have no idea what C is all about..
1. What does the following code display?

int arr[4], i;
for (i=0; i<4; ++i)
    arr[i]=i+3;
cout<<endl;
for (i=0; i<4; ++i)
   cout<<setw(4) << arr[i];

cout<<endl;
for ( i=3; i >=0; --i)
    cout<<setw(4)  << arr[i];

2. Write a loop to display only the elements of d_array[10] having an even number subscript starting from zero..
3. Declare a two dimensional array, arr_2d, that contains 15 rows, each of which will store 12 integers

5. declare a string called birth_date that is to hold a date in the form of xx/xx/xx. code statements that prompts the user to enter his/her birth date in the form xx/xx/xx and place birth date into the string birth_date

6. Declare an array of character pointers that is initialized to point to the name of the months of the year..