A CLI Calculator with math constants and variables, all written in Go.
Run ./golang-calculator, then enter a math expression with numbers, () as parenthesis, +-*/ for basic operations, % for modulo, and ^ exponentiation. For example,
> ((5*76/19-3*3)^2+10)%89
2023/08/29 00:18:52 input: "((5*76/19-3*3)^2+10)%89"
2023/08/29 00:18:52 tokens: [( ( 5 * 76 / 19 - 3 * 3 ) ^ 2 + 10 ) % 89]
2023/08/29 00:18:52 rpn: [5 76 * 19 / 3 3 * - 2 ^ 10 + 89 %]
((5*76/19-3*3)^2+10)%89 = 42.000000
The constants "e" and "pi" can be used in expressions. They are case insensitive. For example,
> pi
2023/08/29 00:13:12 input: "pi"
2023/08/29 00:13:12 tokens: [pi]
2023/08/29 00:13:12 rpn: [pi]
pi = 3.141593
> Pi
2023/08/29 00:13:16 input: "Pi"
2023/08/29 00:13:16 tokens: [Pi]
2023/08/29 00:13:16 rpn: [pi]
Pi = 3.141593
You can save results as variables!
> phi = (1+5^0.5)/2
2023/08/29 00:09:00 input: "phi = (1+5^0.5)/2"
2023/08/29 00:09:00 tokens: [( 1 + 5 ^ 0.5 ) / 2]
2023/08/29 00:09:00 rpn: [1 5 0.5 ^ + 2 /]
2023/08/29 00:09:00 Key phi is new, will set it to 1.618034
phi = (1+5^0.5)/2 = 1.618034
> phi^2
2023/08/29 00:09:10 input: "phi^2"
2023/08/29 00:09:10 tokens: [phi ^ 2]
2023/08/29 00:09:10 rpn: [phi 2 ^]
phi^2 = 2.618034
- They must only be letters, and are case insensitive
- They can't have the same name as existing constants (currently only
eandpi) - They can't be the same name as commands (currently "help", "exit", and "quit")