v 0 0 0

v 1 2. 3.0
v +1 +2. +3.0
v -1 -2. -3.0

v 1e2 2.e1 3.1e2
v +1e2 +2.e1 +3.1e2
v -1e2 -2.e1 -3.1e2

v 1e+2 2.e+1 3.1+e2
v +1e+2 +2.e+1 +3.1+e2
v -1e+2 -2.e+1 -3.1+e2

v 1e-2 2.e-1 3.1-e2
v +1e-2 +2.e-1 +3.1-e2
v -1e-2 -2.e-1 -3.1-e2

v 1e10 2.e01 3.1e10

v 1E2 2.E1 3.1E2

f 1 2 4