GWBASIC User's Manual

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GW-BASIC <strong>User's</strong> Guide INSTR Function Purpose: To search for the first occurrence of string y$ in x$, and return the position at which the string is found. Syntax: INSTR([n,]x$,y$) Comments: Optional offset n sets the position for starting the search. The default value for n is 1. If n equals zero, the error message "Illegal argument in line number" is returned. n must be within the range of 1 to 255. If n is out of this range, an "Illegal Function Call" error is returned. INSTR returns 0 if: ● n > LEN(x$) ● x$ is null ● y$ cannot be found If y$ is null, INSTR returns n. x$ and y$ may be string variables, string expressions, or string literals. Examples: 10 X$="ABCDEBXYZ" 20 Y$="B" 30 PRINT INSTR(X$, Y$); INSTR(4, X$, Y$) RUN 2 6 The interpreter searches the string "ABCDFBXYZ" and finds the first occurrence of the character B at position 2 in the string. It then starts another search at position 4 (D) and finds the second match at position 6 (B). The last three characters are ignored, since all conditions set out in line 30 were satisfied. file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/INSTR.html28/03/2004 21.29.33
GW-BASIC <strong>User's</strong> Guide IOCTL Statement Purpose: To allow GW-BASIC to send a "control data" string to a character device driver anytime after the driver has been opened. Syntax: IOCTL[#]file number,string Comments: file number is the file number open to the device driver. string is a valid string expression containing characters that control the device. IOCTL commands are generally 2 to 3 characters followed by an optional alphanumeric argument. An IOCTL string may be up to 255 bytes long, with commands within the string separated by semicolons. Examples: If a user had installed a driver to replace lpt1, and that driver was able to set page length (the number of lines to print on a page before issuing a form feed), then the following lines would open the new lpt1 driver and set the page length to 66 lines: OPEN "LPT1:" FOR OUTPUT AS #1 IOCTL #1, "PL66" The following statements open lpt1 with an initial page length of 56 lines: OPEN "\DEV\LPT1" FOR OUTPUT AS #1 IOCTL #1, "PL56" file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/IOCTL.html28/03/2004 21.29.33
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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 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 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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GW-BASIC User's Guide COM(n) Statem
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GW-BASIC User's Guide CONT Command
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GW-BASIC User's Guide CSRLIN Variab
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GW-BASIC User's Guide CVI, CVS, CVD
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GW-BASIC User's Guide DATA Statemen
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GW-BASIC User's Guide RESTORE State
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GW-BASIC User's Guide the value of
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GW-BASIC User's Guide DEFINT/SNG/DB
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GW-BASIC User's Guide DEF and SEG m
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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 215 and 216: GW-BASIC User's Guide OCT$ Function
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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
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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
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GW-BASIC User's Guide PUT Statement
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GW-BASIC User's Guide RND Function
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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 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 WRITE Stateme
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