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Readme.md
Building
 Have dotnetsdk installed
 Go to the directory where fskalc is located
 Run
dotnet restore
to restore theobj/
directory  Run
dotnet run
for debug run ./release.sh
for release run, the binary will be found in bin/Release/net[version]/[platform]/publish/fskalc, and also will be copied to the active directory
Reference
The following is an informal overview of FSKalc's capabilties.
Expressions
Number literal
Example:
8.5
Variable read
Example:
a
Will print an error message if variable is undefined. The ans
variable implicitly refers to the result of the last expression statement.
Parentheses for precedence
Example:
(5+6)*7
Parentheses increase precedence.
Function calls
Functions are called with !.
Example:
sin! pi/2
Multile arguments need to be separated with commas.
logx! 5, 3
Arithmetic operators
The following operators are valid, in decreasing precedence:
^
power; right associative
unary negation; note that multiple negations next to eachother are invalid! factor precedence:
*
multiplication; left associative/
division; left associative//
integer (flooring) division; left associative%
modulo; left associative if no binary operator is found, multiplication is assumed
 term precedence:
+
addition; left associative
subtraction; left associative
Statements
Statements are the top level construct. Every line in an FSKalc program has to be a statement.
Expression statement
Any valid expression is also a valid statement. The result of expression statements is printed to the screen, and also assigned to the variable names ans
.
Variable assignments
Variable assignments have the following syntax:
identifier = expression
Where the identifier is a string of characters containing only letters and underscores.
Existing variables or functions can be overwritten by new variables/functions.
Function declaration
Function declaration has the following syntax, demonstrated by an example below.
double x = x * 2
Multiple parameters need to be declared with commas separating.
sum x, y = x + y
Warning! as there are no scopes in FSKalc, passing arguments to functions will modify the global scope.
Builtins
Builtin Constants
 pi
 tau (pi * 2)
 e (euler's number)
 inf (infinity)
 nan (not a number)
Builtin Functions
 sin, cos, tan  they take 1 argument, in radians
 arcsin, arccos, arctan  they take 1 argument, they return in radians
 sqrt  returns square root
 log  logarithm base of 10
 ln  natural logarithm
 exp  returns e to the power of the argument
 rtx  returns the xth root (1st argument: base, 2nd argument: val)
 logx  returns the base x log (1st argument: base, 2nd argument: val)
Comments
Comments can be inside matching (*
, *)
parentheses.