GWBASIC User's Manual

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GW-BASIC <strong>User's</strong> Guide ERASE Statement Purpose: To eliminate arrays from a program. Syntax: ERASE list of array variables Comments: Arrays may be re-dimensioned after they are erased, or the memory space previously allocated to the array may be used for other purposes. If an attempt is made to re-dimension an array without first erasing it, an error occurs. Examples: 200 DIM B (250) . . . 450 ERASE A, B 460 DIM B(3, 4) Arrays A and B are eliminated from the program. The B array is re-dimensioned to a 3-column by 4-row array (12 elements), all of which are set to a zero value. file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/ERASE.html28/03/2004 21.29.24
GW-BASIC <strong>User's</strong> Guide ERDEV and ERDEV$ Variables Purpose: To return the actual value (ERDEV) of a device error, and the name of the device (ERDEV$) causing the error. Syntax: ERDEV ERDEV$ Comments: ERDEV will contain the error code from interrupt 24H in the lower 8 bits. Bits 8 to 15 from the attribute word in the Device Header Block are mapped directly into the upper 8 bits. ERDEV$ will contain the 8-byte character device name if the error was on a character device. It will contain the 2 byte block device name (A:, B:, etc.) if the device was not a character device. Examples: Installed device driver lpt2: caused a "Printer out of paper" error via INT 24H. ERDEV contains the error number 9 in the lower 8 bits, while the upper 8 bits contain the upper byte of the Device Header word attributes. ERDEV$ contains "LPT2: ". file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/ERDEV.html28/03/2004 21.29.25
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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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Page 161 and 162: GW-BASIC User's Guide PRESET and PS
Page 163 and 164: GW-BASIC User's Guide CLEAR Command
Page 165 and 166: GW-BASIC User's Guide CLOSE Stateme
Page 167 and 168: GW-BASIC User's Guide COM(n) Statem
Page 169 and 170: GW-BASIC User's Guide CONT Command
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Page 175 and 176: GW-BASIC User's Guide DATA Statemen
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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: GW-BASIC User's Guide EOF Function
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
Page 207 and 208: GW-BASIC User's Guide FOR ... NEXT
Page 209 and 210: GW-BASIC User's Guide FRE Function
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Page 215 and 216: GW-BASIC User's Guide OCT$ Function
Page 217 and 218: GW-BASIC User's Guide Testing Equal
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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
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GW-BASIC User's Guide LLIST Command
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GW-BASIC User's Guide LOC Function
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GW-BASIC User's Guide Makes the cur
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GW-BASIC User's Guide It is expecte
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GW-BASIC User's Guide LOG Function
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GW-BASIC User's Guide MID$ Statemen
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GW-BASIC User's Guide NAME Command
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GW-BASIC User's Guide ON ERROR GOTO
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GW-BASIC User's Guide ON ... GOSUB
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GW-BASIC User's Guide reclen is an
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GW-BASIC User's Guide ● Files may
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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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