ALGOL 68R - F00L

F00L

The ALGOL 68-R compiler initialised unused memory to the value -6815700.

This value was chosen because:

• As an integer it was a large negative value.
• As an address it was beyond the maximum address for any practical program on an ICL 1900.
• As an instruction it was illegal.
• As text it displayed as F00L.
• As a floating point number it had the overflow bit set.

The same value was used to represent nil.