This is a function to do the same as isalpha() in C. It returns a 1 if temp is a letter of the English alphabet, otherwise zero is returned. Generally a call to this function would

                                    ` This code was downloaded from The Game Creators
                                    ` It is reproduced here with full permission
                                    ` http://www.thegamecreators.com
                                    
                                    Rem PJY - this is a function to do the same as isalpha() in C
Rem It returns a non-zero if temp is a letter of the English alphabet, otherwise zero is returned
FUNCTION isalpha(temp)

     if ((temp >= 16) AND (temp <= 25))

          EXITFUNCTION 1

     endif

     if ((temp >= 30) AND (temp <= 38))

          EXITFUNCTION 1

     endif

     if ((temp >= 44) AND (temp <= 50))

          EXITFUNCTION 1

     endif

ENDFUNCTION 0