2.0
2.[0]
2.[00000]
2.000[00]
3.45[45]
3.46[45]
3.111[333]
3.111[3]
3.[3]
1 + 1/2
1 + 0.5
3.5 + 19.2
3.5 + 1/3
1 == 0.[9]
1/7.0
1/19.0
1/31.0
17/97.0
1/999.0
1/991.0
(1/3.0)^90
(1.0/10^99)
(1.0/10^100)
(1.0/10^101)