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17.7.5 Character and Numeric values: 'ord()' and 'chr()'
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The 'ordchr' extension adds two functions, named 'ord()' and 'chr()', as
follows:

'@load "ordchr"'
     This is how you load the extension.

'number = ord(string)'
     Return the numeric value of the first character in 'string'.

'char = chr(number)'
     Return a string whose first character is that represented by
     'number'.

   These functions are inspired by the Pascal language functions of the
same name.  Here is an example:

     @load "ordchr"
     ...
     printf("The numeric value of 'A' is %d\n", ord("A"))
     printf("The string value of 65 is %s\n", chr(65))