f(42) = 42
f(-1) = 1
g(1,2,3.14) = 2.00
g(0,2,3.14) = 3.14
h(1,2) = true
h(0,2) = false
h(1,0) = false
k(1,2,3.14) = true
k(0,2,3.14) = true
k(1,0,3.14) = false
k(0,2,0.00) = false