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Try #include <fs.h>

Your code is wrong in almost every way ...
- for every x there will be a j so that j%x==0, which is obvious because j goes from 2 to x
- you sum up the wrong value (j instead of x)
- you sum up in...

There's no portable way to do this.

Try SDL, a multimedia library: Simple DirectMedia Layer
It will allow you to read each key's state individually (within the limitations of your keyboard).

Arrays can't be assigned.
You have to use strcpy (in C) or std::string (C++).

Also, you compare b and c although they are arrays.
What you do then is compare their addresses ...
I guess you have a lot to learn still, maybe you should get a good introduction before trying...

Of course those files are renamed on the server.
In the simplest case, each file just gets a unique ID which is an increasing number: 1.jpg, 2.jpg, 3.jpg, ...
But probably they use some kind of...

However, in Tetris only 90° rotations are allowed, which kind of simplifies this formula because all the sin and cos terms become -1, 0 or 1!

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Just do newArray[i][j] = oldArray[i/2][j/2] for each i, j.

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Don't be afraid! When you are asked to write code only using pen & paper, nobody should expect your code to be 100% correct.
At least it was like this during my studies :)

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You can also do it by AND-ing the integer with 1, 2, 4, 8, 16, ...
Each AND will check the presence of one bit. Record the highest bit that was set.

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Do you need help with:
- actually rotating the shapes?
- checking if a rotation is "allowed" by the game?
- displaying the rotated shapes?

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Another thing:
You first declare "int i" outside the loop and then again in "for(int i".
This is probably not what you want, as you will have two "i" variables. One will become inaccessible after...

As it has been said already, there is no need to use threads.
Even though it might appear like the objects are all moving "at the same time", really they don't have to!
Regarding the ghost logic:...

You might need to simulate key presses if the username/password can't be given to the program using command line arguments.
Is this the case?

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What exactly do you mean with "extract an image"?
Is it "hidden" somewhere inside a bigger file? If yes, then you should scan the file for a JPG header and if you find it, try to read a JPG from...