Mathematical Calculations & Expression Evaluation: -------------------------------------------------- Gui4Cli will evaluate a mathematical expression, if enclosed in brackets with a \$ (dollar sign) in front. x = \$(4*2) ; will set x to 8 This can be used anywhere, just as if it were a variable : Say 'The result is \$(45/(2*4.56))\n' Gui4Cli will read brackets as if they were quotes - i.e. you can have spaces inside the brackets without having to quote the whole thing : x = \$( 4 * 2 ) You can also have variables in the brackets, but.. BECAREFULL : Gui4Cli allows almost any character to be a part of a variable name. (This is done because file names - which can have almost any character in them - can also be variables (env:) or part of the specification of variables (GuiName/VarName)) So Gui4Cli will also consider things such as +, *, -, / etc to be included in the variable name if there is no space between the end of the name and the operator : x = \$(\$var*3) ; <- wrong is wrong, because Gui4Cli will try to find variable "var*3" Gui4Cli will understand the end of a variable name if it is followed by a space, or a bracket or a '\', so x = \$(\$var *3) ; is correct x = \$(3*\$var) ; is correct x = \$(\$var\*3) ; is correct The available operators are : + - * / as you know.. ^ means to the power of = 4^2 = 16 Note that to get a square root you can do : x = \$(25^(1/2)) ; 25 to the half = 5 Inside the brackets, you can also use the following math functions : abs(x) absolute value of x sin(x) sin of x cos(x) cosine of x tan(x) tagent of x log(x) logarithm of x ln(x) natural log of x exp(x) exp of x pi = 3.141592654 example : x = \$(\$MyVariable * pi + tan(0.85)-(4*sin(45))) I used to know all this stuff, now I can't remember a thing.. The parser which does the actual calculation was written by Kittiphan Techakittiroj, who put it in the public domain where from I appropriated it with his blessings and put it to good use. Here's a calculator : @{" Run Gui " system "gui guis:Tools/Calc.gc"} @{" Source " link "guis:Tools/Calc.gc/Main"}