GWBASIC User's Manual

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GW-BASIC User's Guide INKEY$ Variable Purpose: To return one character read from the keyboard. Syntax: v$=INKEY$ Comments: If no character is pending in the keyboard buffer, a null string (length zero) is returned. If several characters are pending, only the first is returned. The string will be one or two characters in length. Two character strings are used to return the extended codes described in Appendix C of the GW- BASIC User's Guide. The first character of a two character code is zero. No characters are displayed on the screen, and all characters except the following are passed to the program: CTRL-BREAK CTRL-NUM LOCK CTRL-ALT-DEL CTRL-PRTSCR PRTSCR Examples: 10 CLS: PRINT"PRESS RETURN 20 TIMELIMIT% = 1000 30 GOSUB 1010 40 IF TIMEOUT% THEN PRINT "TOO LONG" ELSE PRINT "GOOD SHOW" 50 PRINT RESPONSE$ 60 END . . . 1000 REM TIMED INPUT SUBROUTINE 1010 RESPONSE$="" 1020 FOR N%=1 TO TIMELIMIT% 1030 A$=INKEY$:IF LEN(A$)=0 THEN 1060 1040 IF ASC(A$)=13 THEN TIMEOUT%=0: RETURN 1050 RESPONSE$=RESPONSE$+A$ 1060 NEXT N% file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/INKEYS.html (1 of 2)28/03/2004 21.29.30
GW-BASIC User's Guide 1070 TIMEOUT%=1: RETURN When this program is executed, and if the RETURN key is pressed before 1000 loops are completed, then "GOOD SHOW" is printed on the screen. Otherwise, "TOO LONG" is printed. Since an INKEY$ statement scans the keyboard only once, place INKEY$ statements within loops to provide adequate response times for the operator. file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/INKEYS.html (2 of 2)28/03/2004 21.29.30
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GWBASIC User's Manual User's Guide
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GWBASIC User's Manual FILES Command
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GWBASIC User's Manual PSET Statemen
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GW-BASIC User's Guide Chapter 1 Wel
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GW-BASIC User's Guide The Glossary
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GW-BASIC User's Guide 2.2.2 Indirec
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GW-BASIC User's Guide Sample GW-BAS
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GW-BASIC User's Guide system assume
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GW-BASIC User's Guide Note Reuse of
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GW-BASIC User's Guide moves the cha
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GW-BASIC User's Guide CTRL-G Causes
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GW-BASIC User's Guide BASIC User's
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GW-BASIC User's Guide Note ↵ (arr
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GW-BASIC User's Guide Appendix H Ke
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GW-BASIC User's Guide KEY(n) n is a
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GW-BASIC User's Guide STRIG Trappin
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GW-BASIC User's Guide KEY(n) Statem
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GW-BASIC User's Guide LOC(x) Return
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GW-BASIC User's Guide 15 KEY OFF:CL
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GW-BASIC User's Guide and check the
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GW-BASIC User's Guide Chapter 3 Rev
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GW-BASIC User's Guide until the RUN
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GW-BASIC User's Guide To save a fil
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GW-BASIC User's Guide Hexadecimal H
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GW-BASIC User's Guide The GW-BASIC
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GW-BASIC User's Guide The arithmeti
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GW-BASIC User's Guide Modulus arith
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GW-BASIC User's Guide EQV X Y X EQV
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GW-BASIC User's Guide RUN FILENAME
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GW-BASIC User's Guide OPTION BASE S
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GW-BASIC User's Guide LET Statement
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GW-BASIC User's Guide . . 400 R=1:
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GW-BASIC User's Guide ● Sequentia
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GW-BASIC User's Guide The program i
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GW-BASIC User's Guide PUT #1, CODE%
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GW-BASIC User's Guide number. Lines
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GW-BASIC User's Guide Appendix A Er
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GW-BASIC User's Guide 18 Undefined
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GW-BASIC User's Guide 59-60Unprinta
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GW-BASIC User's Guide 75 Path/File
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GW-BASIC User's Guide Appendix C AS
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GW-BASIC User's Guide Appendix D As
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GW-BASIC User's Guide moved the cur
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GW-BASIC User's Guide that the code
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GW-BASIC User's Guide converted to
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GW-BASIC User's Guide DEF USR State
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GW-BASIC User's Guide USR Function
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GW-BASIC User's Guide E.3 Multiple
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GW-BASIC User's Guide 8 8 18 24 90
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GW-BASIC User's Guide _ Underscore.
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GW-BASIC User's Guide Data represen
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GW-BASIC User's Guide binary system
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GW-BASIC User's Guide computers or
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GW-BASIC User's Guide double-precis
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GW-BASIC User's Guide graphics A ha
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GW-BASIC User's Guide precisely ref
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GW-BASIC User's Guide An extra-bit
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GW-BASIC User's Guide single-densit
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GW-BASIC User's Guide ABS Function
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GW-BASIC User's Guide CHR$ Function
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GW-BASIC User's Guide AUTO Command
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GW-BASIC User's Guide BLOAD Command
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GW-BASIC User's Guide BSAVE Command
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GW-BASIC User's Guide Note ● Valu
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GW-BASIC User's Guide CDBL Function
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GW-BASIC User's Guide INT Function
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GW-BASIC User's Guide CHAIN Stateme
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GW-BASIC User's Guide MERGE Command
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GW-BASIC User's Guide CIRCLE Statem
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GW-BASIC User's Guide COLOR Stateme
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GW-BASIC User's Guide For more info
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GW-BASIC User's Guide EGA with Enha
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GW-BASIC User's Guide SCREEN 10 ●
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GW-BASIC User's Guide For various s
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GW-BASIC User's Guide PALETTE, PALE
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GW-BASIC User's Guide Enhanced d EG
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GW-BASIC User's Guide N Move, but r
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GW-BASIC User's Guide LINE Statemen
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GW-BASIC User's Guide LINE (0,0)-(1
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GW-BASIC User's Guide tile_length i
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GW-BASIC User's Guide PRESET and PS
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GW-BASIC User's Guide CLEAR Command
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GW-BASIC User's Guide CLOSE Stateme
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Page 169 and 170: GW-BASIC User's Guide CONT Command
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Page 185 and 186: GW-BASIC User's Guide POKE Statemen
Page 187 and 188: GW-BASIC User's Guide EDIT Command
Page 189 and 190: GW-BASIC User's Guide ENVIRON State
Page 191 and 192: GW-BASIC User's Guide ENVIRON$ Func
Page 193 and 194: GW-BASIC User's Guide SHELL Stateme
Page 195 and 196: GW-BASIC User's Guide EOF Function
Page 197 and 198: GW-BASIC User's Guide ERDEV and ERD
Page 199 and 200: GW-BASIC User's Guide ERROR Stateme
Page 201 and 202: GW-BASIC User's Guide EXP Function
Page 203 and 204: GW-BASIC User's Guide FIELD Stateme
Page 205 and 206: GW-BASIC User's Guide GET Statement
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Page 209 and 210: GW-BASIC User's Guide FRE Function
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Page 213 and 214: GW-BASIC User's Guide GOTO Statemen
Page 215 and 216: GW-BASIC User's Guide OCT$ Function
Page 217: GW-BASIC User's Guide Testing Equal
Page 221 and 222: GW-BASIC User's Guide INPUT Stateme
Page 223 and 224: GW-BASIC User's Guide PRINT Stateme
Page 225 and 226: GW-BASIC User's Guide STRING$ Funct
Page 227 and 228: GW-BASIC User's Guide PRINT USING S
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Page 231 and 232: GW-BASIC User's Guide WIDTH Stateme
Page 233 and 234: GW-BASIC User's Guide INPUT# Statem
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Page 237 and 238: GW-BASIC User's Guide IOCTL Stateme
Page 239 and 240: GW-BASIC User's Guide KILL Command
Page 241 and 242: GW-BASIC User's Guide MID$ Function
Page 243 and 244: GW-BASIC User's Guide LEN FUNCTION
Page 245 and 246: GW-BASIC User's Guide LINE INPUT# S
Page 247 and 248: GW-BASIC User's Guide LLIST Command
Page 249 and 250: GW-BASIC User's Guide LOC Function
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Page 257 and 258: GW-BASIC User's Guide MID$ Statemen
Page 259 and 260: GW-BASIC User's Guide NAME Command
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GW-BASIC User's Guide RESET Command
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GW-BASIC User's Guide Examples: The
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GW-BASIC User's Guide when using GE
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GW-BASIC User's Guide PCOPY Command
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GW-BASIC User's Guide n = 5 Returns
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GW-BASIC User's Guide . (period) A
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GW-BASIC User's Guide PMAP Function
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GW-BASIC User's Guide The following
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GW-BASIC User's Guide If the string
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GW-BASIC User's Guide PUT Statement
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GW-BASIC User's Guide RANDOMIZE Sta
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GW-BASIC User's Guide RND Function
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GW-BASIC User's Guide . . . 129 FOR
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GW-BASIC User's Guide RESUME Statem
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GW-BASIC User's Guide RMDIR Command
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GW-BASIC User's Guide SAVE Command
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GW-BASIC User's Guide SGN Function
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GW-BASIC User's Guide SOUND Stateme
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GW-BASIC User's Guide SPACE$ Functi
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GW-BASIC User's Guide SQR Function
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GW-BASIC User's Guide STOP Statemen
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GW-BASIC User's Guide VAL Function
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GW-BASIC User's Guide STRIG(n) Stat
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GW-BASIC User's Guide SYSTEM Comman
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GW-BASIC User's Guide TAN Function
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GW-BASIC User's Guide 08:00:05 The
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GW-BASIC User's Guide TRON/TROFF Co
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GW-BASIC User's Guide 0 1 Mode The
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GW-BASIC User's Guide VARPTR$ Funct
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GW-BASIC User's Guide The following
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GW-BASIC User's Guide WAIT Statemen
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GW-BASIC User's Guide WINDOW Statem
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GW-BASIC User's Guide WRITE Stateme
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GWBASIC User's Manual

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