04-27-2009, 07:32 PM
Not sure whether this is as intended, but it's not quite compatible with Sinclair Basic:
LET K$="1234567890"
PRINT K$(TO 3)
PRINT K$( 3 TO)
All seems to compile - though strings are numbered from 0, whereas Sinclair basic numbers them from 1.
So ZX Basic gives the output:
1234, where Sinclair basic would give the output 123
If the aim is to be able to compile Sinclair Basic, we're not there with that one. (Perhaps a switch, or configurable option?)
Also:
Print K$(3) fails. We would need to use k$(3 TO 3). Is this a bug?
PRINT K$( TO ) also fails, and ZX Basic allows it. It's an unusual corner case, though - it means the same thing as just K$. If it was to be supported for compatibility, a preprocessor tweak ought to be able to optimize it to disappear before the compiler saw it.
LET K$="1234567890"
PRINT K$(TO 3)
PRINT K$( 3 TO)
All seems to compile - though strings are numbered from 0, whereas Sinclair basic numbers them from 1.
So ZX Basic gives the output:
1234, where Sinclair basic would give the output 123
If the aim is to be able to compile Sinclair Basic, we're not there with that one. (Perhaps a switch, or configurable option?)
Also:
Print K$(3) fails. We would need to use k$(3 TO 3). Is this a bug?
PRINT K$( TO ) also fails, and ZX Basic allows it. It's an unusual corner case, though - it means the same thing as just K$. If it was to be supported for compatibility, a preprocessor tweak ought to be able to optimize it to disappear before the compiler saw it.