Let f(x) be the smallest nonnegative number y such that x - y is an integer. Compute -2.2 + f(-2.2).
f(-2.2) = -2.2 - y = integer
We're trying to get rid of the fractional part 0.2. Since y > 0, y = 0.8
-2.2 + 0.8 = -1.4
+310 
