Advanced text-based calculator
Example: 2+2
Output: 4.0
Example: 3-2
Output: 1.0
Example: 3*2
Output: 6.0
Example: 6/2
Output: 3.0
Example: (((2+2)+3*7)/5)+1
Output: 6.0
Example: k16
Output: 4.0
Example: t45
Output: 0.9999999999999999
Example: s90
Output: 1.0
Example: c60
Output: 0.5000000000000001
Example: at1
Output: 45.0
Example: as1
Output: 90.0
Example: ac0.5
Output: 60.00000000000001
Example: l10
Output: 1.0
Example: lne
Output: 1.0
Example: 5P2
Output: 20.0
Example: 5C2
Output: 10.0
Example: 5xb
Output: 0.2
Example: 5xk
Output: 25.0
Example: 5xu
Output: 125.0
Example: 5xf
Output: 120.0
Example: ht45
Output: 1.0
Example: hs90
Output: 6.102016471589175E38
Example: hc45
Output: 5.710036949078403E25
Example: p
Output: 3.141592653589793
Example: e
Output: 2.718281828459045

