What does y -= m < 3 mean?

Question

While looking through some example C code, I came across this:

y -= m < 3;

What does this do? It it some kind of condensed for loop or som

Answer 1

I can't tell you want it's for, but I can tell you what it does:

m < 3 returns an int of 0 or 1 representing a boolean value.

if m is less than 3, the statement evalutates as: y -= 1 or y = y - 1;

if m is greater than or equal to 3, the statement evalutates as y -= 0 or y = y - 0. Overall in this case, the statement does nothing.