Arithmetic evaluation: Difference between revisions
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(→{{header|TXR}}: New implementation with AST construction and evaluation.) |
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Create a program which parses and evaluates arithmetic expressions. |
Create a program which parses and evaluates arithmetic expressions. |
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;Requirements: |
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* An [[wp:Abstract_syntax_tree|abstract-syntax tree]] (AST) for the expression must be created from parsing the input. |
* An [[wp:Abstract_syntax_tree|abstract-syntax tree]] (AST) for the expression must be created from parsing the input. |
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* The AST must be used in evaluation, also, so the input may not be directly evaluated (e.g. by calling eval or a similar language feature.) |
* The AST must be used in evaluation, also, so the input may not be directly evaluated (e.g. by calling eval or a similar language feature.) |
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* Precedence-control parentheses must also be supported. |
* Precedence-control parentheses must also be supported. |
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;Note: |
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For those who don't remember, mathematical precedence is as follows: |
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* Parentheses |
* Parentheses |
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* Multiplication/Division (left to right) |
* Multiplication/Division (left to right) |
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* Addition/Subtraction (left to right) |
* Addition/Subtraction (left to right) |
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;C.f: |
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* [[Parsing/RPN calculator algorithm]]. |
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* [[Parsing/RPN to infix conversion]]. |
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=={{header|Ada}}== |
=={{header|Ada}}== |
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