Convert CHAR to INTEGER

[Helpdesk]

How do I convert a CHAR (from serial input) to an INTEGER?

[cfbsoftware]

The built-in ORD function will typecast a CHAR to INTEGER i.e.

Code: Select all

VAR
  ch: CHAR;
  i: INTEGER;
...
...
  i := ORD(ch);

This gives you the corresponding numeric ASCII value for that character. Knowing this, if you want to convert a single character (e.g. '9') to the integer value (e.g. 9) you can then say:

Code: Select all

IF ('0' <= ch) & (ch <= '9') THEN i := ORD(ch) - ORD('0') END;

Note that the Convert library procedure StrToInt can be used to convert strings to
integers.