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1.1 KiB
1.1 KiB
Pycalc
Pycalc is a simple expression calculator. It can evaluate mathematical expressions, and output the result of the evaluation.
How it works
- Scan the expression
- Check for malformed expression and invalid characters
- Tokenize the expression (I wrote a custom parser to do this)
- If there are any parantheses, replace the parantheses with the result of the sub-expression.
- Evaluate the overall expression (which should no longer have any parantheses)
Rather than building a tree from the expression (which is the recommended approach), I have opted to perform the substitutions in-place. This means that the result of an operation replaces the operation itself.
The reason I chose to do this, is that my parsing algorithm considers everything inside parantheses as a single token. Therefore, it is fairly easy to replace this token with the result of the expression within the parantheses.
Features
- Order of operations
- Arbitrary whitespace
- Parantheses
- Simple error checking
To-do
Simple algebraic parsing (assign values to variables, etc.)- More robust error-checking