I'm sorry. I've only been doing C++ for 2 1/2 months and I suck.
Code:
//Declare ffcy, ffcx and position as int variables first (duh)
//Header file is not needed
SomariaBlock->Y = ffcy;
SomariaBlock->X = ffcx;
position = (ffcy & 240)+(ffcx>>4)
Screen->ComboS [position] = 15;