75 lines
1.2 KiB
Markdown
75 lines
1.2 KiB
Markdown
# PHP Calc
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The CLI calculator you never knew you needed. Also usable as a library!
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## Usage
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### CLI
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Call with an expression to evaluate:
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$ calc "42*atan(pi/2)"
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42.163162517863
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Or call without arguments to go interactive:
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$ calc
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~ 42*atan(pi/2)
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42.163162517863
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### Library
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As simple as falling off a rock:
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use NoccyLabs\PhpCalc\Calculator;
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$calc = new Calculator();
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$result = $calc->evaluate("42 * atan(pi/2)");
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## What it does
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Supported operations:
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* `+` addition
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* `-` subtraction
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* `*` multiplication
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* `/` division
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* `^` exponent/raise to power
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Supported functions:
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* abs
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* acos
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* acosh
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* asin
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* asin
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* atan
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* atanh
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* ceil
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* cos
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* cosh
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* floor
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* sin
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* sinh
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* log
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* round
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* sqrt
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* tan
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* tanh
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Constants:
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* `pi`
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## Useful tips
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* You can set the precision using the `_p` variable. If the expression is passed on the
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command line, prepend the variable followed by a semicolon, such as `_p=2;pi` for the
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result *3.14*.
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## Bugs and known issues
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* Negative numbers and subtraction should be surrounded by whitespace to parse properly.
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Passing `2-1` will result in `2` and `-1`, returning *2* and a warning. Passing
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`2 - 1` will return `1` as expected, as will `2- 1`.
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