From: rjh@cpax.org.uk   
      
   On 14/12/2022 1:57 pm, Richard Heathfield wrote:   
   > On 14/12/2022 1:23 pm, Stefan Ram wrote:   
   >> Richard Heathfield  writes:   
   >>> Your problem is closely related to the very first question I was   
   >>> ever posed (in early 1982), by a friend who needed to be able to   
   >>> establish cleanly in a single expression whether a keypress was a   
   >>> digit (ASCII 48-57). The relevant dialect of BASIC didn't have   
   >>> anything like an isdigit function.   
   >>> The friend was on the point of giving up on me when I handed him   
   >>>                   ABS(K-52.5)<4.5   
   >>   
   >>    "K >= 48 AND K <= 57" also is a single expression in BASIC.   
   >   
   > The available keywords were LET, PRINT, END, FOR...NEXT, GOTO,   
   > GOSUB...RETURN, IF...THEN line number, DEF, READ, DATA, DIM, and   
   > REM. AND was not amongst them. Also available were these   
   > functions: ABS, ATN (arc tan), COS, EXP, INT, LOG, RND, SIN, SQR   
   > (root).   
      
   ...and I missed TAN.   
      
   --   
   Richard Heathfield   
   Email: rjh at cpax dot org dot uk   
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