Thread: Subtracting a decimal value from a Char?

I'm looking at Muller's Micro-Max chess engine, trying to port it to z80 ASM just as a fun challenge. https://home.hccnet.nl/h.g.muller/umax4_8.c
While I consider myself well-versed in z80 as a hobby, I have little experience with C.

I'm looking at this line of code:

Code:

b[16*L+K+8]=(K-4)*(K-4)+(L-3.5)*(L-3.5)

If I'm correct, L was / has been declared as a variable of "char" type. So I'm confused about subtracting 3.5 from a "char" variable. Let's say that K = 7 and L = 7. What would the result be?

Thanks, that answers my question and fixes the problem.