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Basic Principles of Commands
How the Program Works
Understanding the Space Wars Game
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adventure game allow the player array element back to line BEDROOMS beginning and end carriage return Chapter character checks CHOICE COMMAND OR QUESTION computer back computer goes back computer returns computer to line contains the word COST CRATE data file data item dBASE DELETE DF THEN RETURN disk door empty string end of S2 equal fails to find file name find an answer FIRE FOR-NEXT loop FRED JONES goes to line GOTO grid handle indicate INSTR function INSTR(C JOHN SMITH KILL Line 60 listing in Fig main menu main word modified natural language processing object output P=INSTR(Q parsing piece of data PRINT NUMBER prints any statement procedure property name question parser quotation marks RED SQUAD routine sends the computer squad statement containing S1 stored subroutine at line subroutine that prints TBQA techniques TORPEDO UDB program variable WAND X:RETURN X=0 TO NP