57 lines
1.9 KiB
Markdown
57 lines
1.9 KiB
Markdown
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# abcs
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A libabacus front end for the command-line.
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## Syntax
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Please see the libabacus documentation (external/libabacus/README.md) for a guide through the syntax.
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## Implementation
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abcs uses GNU MPFR for its number implementations. It keeps 200 digits of precision, and displays up to 50. By default,
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3 digits are displayed. The `request_precision` function can be used to request more digits to be displayed.
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## RC File
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abcs loads, by default, an `.abcsrc` file in the same directory in which it is run. It parses the whole file ingoring
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newlines and spaces, and evaluates it in order. The RC file can be used to specify constants or declare functions that
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the user wants to re-use between sessions.
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## Provided Functions and Operators
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|Operator|Function|Precedence|
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|--------|--------|----------|
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| < | lt | 1 |
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| <= | lte | 1 |
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| == | equals | 1 |
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| > | gt | 1 |
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| >= | gte | 1 |
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| + | plus | 2 |
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| - | minus | 2 |
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| * | times | 3 |
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| / | divide | 3 |
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| ^ | pow | 3 |
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| - | negate | (prefix) |
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| ! | factorial | (postfix) |
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|Function|Description|
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|--------|----|
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|lt | less than comparator.|
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|lte | less than or equal comparator.|
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|equals| equality comparator. |
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|gt| greater than comparator. |
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|gte| greater than or equal comparator. |
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|plus| addition function. |
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|minus| subtraction function. |
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|times| multiplication function. |
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|divide| division function. |
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|pow| exponentiation function |
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|negate| flip sign of number. |
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|factorial| factorial via the gamma function. |
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|ln|natural logarithm function.|
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|exp| e to the nth power function.|
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|sqrt| square root function.|
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|sin| trigonometric sine function. |
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|cos| trigonometric cosine function. |
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|tan| trigonometric tangent function. |
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|arcsin| trigonometric inverse sine function. |
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|arccos| trigonometric inverse cosine function. |
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|arctan| trigonometric inverse tangent function. |
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|quit| quits the REPL. |
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|request\_precision| requests the given number of digits to be displayed in the REPL. |
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