Mon 16 Mar 11:39:34 CET 2026

doc/Untitled.md

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+## Program Control
+
+### Statement block
+
+A statement block binds single statements enclosed in a curled paranthesis pair. 
+```
+{ Φ Φ Φ .. }
+```
+
+### Conditional Branches
+
+There is only a `if then else` statement branching to conditional statements. Conditional statements can be replaced by statement blocks, too.
+
+| Statement | Description |
+|:--|:--|
+| `if ε:Φ:Φ:.. ` | If expression  ε is true (not equal 0), then the following line statements are executed. |
+| `if ε then Φ:Φ:.. ` | If expression  ε is true (not equal 0), then the following line statements are executed. |
+| `if ε { Φ }` | If expression  ε is true (not equal 0), then the following block statement is executed. |
+| `if ε then { Φ }` | If expression  ε is true (not equal 0), then the following block statement is executed. |
+| `if ε Φ1 else Φ2` | If expression  ε is true (not equal 0), then the following statement Φ1 is executed else Φ2. |
+| `if ε { Φ1 } else { Φ1 }` | If expression  ε is true (not equal 0), then the following block statement Φ1 is executed, else Φ2. |
+
+
+### Loops
+
+There are conuting, conditional, and unconditional loops. Body statements can be replaced by statement blocks, too.
+
+| Statement | Description | F-Stack Frame |
+|:--|:--|
+| `for i = a,b: Φ: Φ: ..` | Counting loop starting with *i*=*a* and terminating with i=b. The default increment value is one. |  F(b,control address,end address,'F') |
+| `for i = a,b do Φ: Φ: ..` | Counting loop starting with *i*=*a* and terminating with i=b. The default increment value is one. |  F(b,control address,end address,'F') |
+| `for i = a,b,s: Φ: Φ: ..` | Counting loop starting with *i*=*a* and looping as long as *i*<=*b*. The increment value (step size) is *s*. | F(b,step,control address,end address,'F') |
+| `while ε: Φ: Φ: ..` | Conditional loop checking the expression ε at start. | F(start address,end address, 'W') | 
+| `while ε do Φ: Φ: ..` | Conditional loop checking the expression ε at start. | F(start address,end address, 'W') | 
+| `do Φ: Φ: .. while ε` | Conditional loop checking the expression ε at end. | F(start address,end address, 'D') |
+| `repeat Φ` | Endless (service) loop, but breakable. |  F(start address,end address, 'D') |
+| `break` | Leave current (innerst) loop | - |
+| `continue` | Branch to end of loop body (starting new loop iteration) | - |
+
+### Functions and Procedures
+
+| Statement | Description | F-Stack Frame |
+|:--|:--|
+| `proc pname { Φ } ` | Defines a procedure (no arguments, no return value) |  - |
+| `func fname(a,b,c) { Φ } ` | Defines a function with arguments (a,b,c) and a return value. |  -  |
+| `return` | Return from procedure call (no return value) | - |
+| `return ε` | Return from function call with  return value ε | - |
+| `call pname` | Call procedure | F() |
+| `call fname(ε,..)` | Call function without return value | F() |
+| `x=call fname(ε,..)` | Call function (in expression) with return value | F() |
+