Need help with C++ program

I am writing this program, and I would like to know if the first part of it is correct, and if it is, I will be able to figure out the rest of the program. I know this is a "do while loop," I just want to be sure that I am doing it the right way. Here is the program.

#include <iostream.h>

void main()
{
int X, Y;

X = 36;
Y = 20:

while (X > Y)
{
X = X - Y;
Y = Y/2;
}
cout<<"X=" <<X<<" and Y =" <<Y<<end1;
}

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/ HERE IS MY ANSWER
/========================================


#include <iostream.h>

void main()
{
int X, Y;

X = 36;
Y = 20:

while (X > Y)
{
X = 16;
Y = 8;
}
cout<<"X=" <<X<<" and Y =" <<Y<<end1;
}

Any help you can give me will be greatly appreciated.

I'm not sure if I understand your question correctly. The code at the top is a valid program, that will run a certain calculation untol X is smaller than Y.
The second code is not the first iteration of the loop in the program!

You start out with X = 36, Y = 20
After one loop: X = 16 (36 - 20) and Y = 10 (20 / 2)
after second loop: X = 6 (16 - 10) and Y = 5 (10 / 2)
after third loop: X - 1 (6 - 5) and Y = 2 (10 / 2, integer style (rounded down))
there is no fourth loop, since X is now smaller than Y.
So output will be