morilib qbflat

Fundermental
Expression
Statements

Fundermental

The morilib qbflat is a high order calculator language which has Quick/Visual BASIC like syntax.
The word which reserved as functions and statements are available as a variable.
The valid variable name begins ASCII alphabets and follows ASCII alphabets or numbers.
Qbflat has only numeric(IEEE double) type.
The value is true if the value is not zero, otherwise The value is false.
In qbflat, the case of alphabets is distinguished.

Subroutines and functions can be defined.
The syntax of defining a function shown as follows.

Function name (argument ...)
  statement
  ...
End Function

To assign a value to function name, you can specify the return value of the function.

The syntax of defining a subroutine shown as follows.
To assign a value to function name, you can specify the return value of the function.

Sub name (argument ...)
  statement
  ...
End Sub

Expressions

In qbflat, the expressions shown as follows. Using "()", you can change priority of operator.
- High priority -

operator	association	description
(unary)- sin cos tan exp log	left to right	negate the sign, computing sin, cos, tan, exp and log, respectively You can use the power of trigonometric function as sin^`positive-value`. You can compute the power of inverted trigonometric function as sin^`negarive-value`. You can also specify the base of logarithm as log_`base`.
^	right to left	power
* /	left to right	multipication, division
+ -	left to right	addition, subtraction
=	left to right	1 if both value is equal, otherwise 0
<>	left to right	1 if both value is not equal, otherwise 0
<	left to right	1 if the left value is less than the right value, otherwise 0
>	left to right	1 if the left value is more than the right value, otherwise 0
<=	left to right	1 if the left value is less than or equal to the right value, otherwise 0
>=	left to right	1 if the left value is more than or equal to the right value, otherwise 0
Not	left to right	logical not
And	left to right	conjunction
Or	left to right	logical sum

Statements

varname=expr: assigns expression to variable.
Print expr: prints expression or string to text screen.
If expr1 Then stat1 ... [ElseIf expr2 Then stat2 ...] [Else statn ...] EndIf: executes stat1 if expr1 is true, stat2 if expr2 is true, otherwise statn.
Else clause is optional.
For varname=expr1 To expr2 [Step number] / Next: assigns expr1 to varname, execute until Next appear, and increases variable by number(default 1).
The loop repeats until variable is more than expr2.
Do While expr statements Loop: executes statements while expr is true.
Do Until expr statements Loop: executes statements until expr is true.
Do statements Loop: executes statements forever. To exit the loop, you can use Exit Loop statement.
Do statements Loop While expr: executes statements while expr is true. statements will be executed at least one time.
Do statements Loop Until expr: executes statements until expr is true. statements will be executed at least one time.
Exit For/Loop/Sub/Function: exits For/Do-Loop/subroutine/function, respectively.
subroutine-name[(arguemnt ...)]: calls a subroutine.