[Ichneumon]

10 FOR X=1 to 1000000

That constant is likely to overflow the integer size on most BASIC interpreters. The most you could get away with would be 32767.

[supercat]

That constant is likely to overflow the integer size on most BASIC interpreters. The most you could get away with would be 32767.

Many microcomputer BASICs used floating-point numbers that could count to 16,777,216 (32-bit) or 4,294,967,296 (40-bit) with to-the-unit accuracy.