?FORMULA TOO COMPLEX ERROR
Commodore Commodore 64
Severity: MinorWhat Does This Error Mean?
?FORMULA TOO COMPLEX ERROR means the expression you wrote has too many nested operations for BASIC's evaluation stack. Simplify by breaking the expression into smaller parts using intermediate variables.
Affected Models
- Commodore 64
- Commodore 64C
- Commodore 128 (C64 mode)
- VICE emulator (C64)
Common Causes
- Too many nested parentheses in one expression
- Too many function calls nested inside each other
- Very long string concatenation expression
- Complex mathematical expression exceeding the evaluation stack
How to Fix It
-
Break the expression into smaller parts.
Instead of A = SIN(COS(TAN(LOG(X))))+SQR(ABS(Y-Z)) Compute: B = LOG(X) : C = TAN(B) : D = COS(C) : A = SIN(D) + SQR(ABS(Y-Z))
-
Use intermediate variables.
Store partial results in variables. This uses more RAM but avoids the stack limit.
-
Simplify string concatenations.
Instead of A$ = B$ + C$ + D$ + E$ + F$ + G$ Do it in steps: A$ = B$ + C$ : A$ = A$ + D$ + E$
Frequently Asked Questions
How deep can I nest expressions on the C64?
Commodore BASIC V2 supports about 10 levels of nesting. Beyond that, the formula evaluation stack overflows.
Is this error common?
Not very. Most programs do not need expressions this complex. It is more common when converting mathematical formulas from textbooks directly into BASIC.