GWBASIC User's Manual

More documents

Recommendations

Info

GW-BASIC <strong>User's</strong> Guide PATH=A:\; COMSPEC=A:\COMMAND.COM The path may be changed to a new value: ENVIRON "PATH=A:\SALES; A:\ACCOUNTING" The path parameter may be appended by using the ENVIRON$ function with the ENVIRON statement: ENVIRON "PATH="+ENVIRON$("PATH")+"; B:\SAMPLES" Finally, delete the parameter COMSPEC: ENVIRON "COMSPEC=;" The environment string table now contains PATH=A:\SALES; A:\ACCOUNTING; B:\SAMPLES file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/ENVIRON.html (2 of 2)28/03/2004 21.29.23
GW-BASIC <strong>User's</strong> Guide ENVIRON$ Function Purpose: To allow the user to retrieve the specified environment string from the environment table. Syntax: v$=ENVIRON$(parmid) v$=ENVIRON$(nthparm) Comments: parmid is a valid string expression containing the parameter to search for. nthparm is an integer expression in the range of 1 to 255. If a string argument is used, ENVIRON$ returns a string containing the text following parmid= from the environment string table. If parmid is not found, then a null string is returned. If a numeric argument is used, ENVIRON$ returns a string containing the nth parameter from the environment string table. If there is no nth parameter, then a null string is returned. The ENVIRON$ function distinguishes between upper- and lowercase. Examples: The following lines: ENVIRON "PATH=A:\SALES; A:\ACOUNTING; B:\MKT:" 'Create entry PRINT ENVIRON$("PATH") 'Print entry will print the following string: A:\SALES; A:\ACCOUNTING; B:\MKT The following line will print the first string in the environment: PRINT ENVIRON$(1) The following program saves the environment string table in an array so that it can be modified for a child process. After the child process completes, the environment is restored. 10 DIM ENVTBL$(10) 20 NPARMS= 1 30 WHILE LEN(ENVIRON$(NPARMS))>0 file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/ENVIRONS.html (1 of 2)28/03/2004 21.29.24
Page 1 and 2:
GWBASIC User's Manual User's Guide
Page 3 and 4:
GWBASIC User's Manual FILES Command
Page 5 and 6:
GWBASIC User's Manual PSET Statemen
Page 7 and 8:
GW-BASIC User's Guide Chapter 1 Wel
Page 9 and 10:
GW-BASIC User's Guide The Glossary
Page 11 and 12:
GW-BASIC User's Guide 2.2.2 Indirec
Page 13 and 14:
GW-BASIC User's Guide Sample GW-BAS
Page 15 and 16:
GW-BASIC User's Guide system assume
Page 17 and 18:
GW-BASIC User's Guide Note Reuse of
Page 19 and 20:
GW-BASIC User's Guide moves the cha
Page 21 and 22:
GW-BASIC User's Guide CTRL-G Causes
Page 23 and 24:
GW-BASIC User's Guide BASIC User's
Page 25 and 26:
GW-BASIC User's Guide Note ↵ (arr
Page 27 and 28:
GW-BASIC User's Guide Appendix H Ke
Page 29 and 30:
GW-BASIC User's Guide KEY(n) n is a
Page 31 and 32:
GW-BASIC User's Guide STRIG Trappin
Page 33 and 34:
GW-BASIC User's Guide KEY(n) Statem
Page 35 and 36:
GW-BASIC User's Guide LOC(x) Return
Page 37 and 38:
GW-BASIC User's Guide 15 KEY OFF:CL
Page 39 and 40:
GW-BASIC User's Guide and check the
Page 41 and 42:
GW-BASIC User's Guide Chapter 3 Rev
Page 43 and 44:
GW-BASIC User's Guide until the RUN
Page 45 and 46:
GW-BASIC User's Guide To save a fil
Page 47 and 48:
GW-BASIC User's Guide Hexadecimal H
Page 49 and 50:
GW-BASIC User's Guide The GW-BASIC
Page 51 and 52:
GW-BASIC User's Guide The arithmeti
Page 53 and 54:
GW-BASIC User's Guide Modulus arith
Page 55 and 56:
GW-BASIC User's Guide EQV X Y X EQV
Page 57 and 58:
GW-BASIC User's Guide RUN FILENAME
Page 59 and 60:
GW-BASIC User's Guide OPTION BASE S
Page 61 and 62:
GW-BASIC User's Guide LET Statement
Page 63 and 64:
GW-BASIC User's Guide . . 400 R=1:
Page 65 and 66:
GW-BASIC User's Guide ● Sequentia
Page 67 and 68:
GW-BASIC User's Guide The program i
Page 69 and 70:
GW-BASIC User's Guide PUT #1, CODE%
Page 71 and 72:
GW-BASIC User's Guide number. Lines
Page 73 and 74:
GW-BASIC User's Guide Appendix A Er
Page 75 and 76:
GW-BASIC User's Guide 18 Undefined
Page 77 and 78:
GW-BASIC User's Guide 59-60Unprinta
Page 79 and 80:
GW-BASIC User's Guide 75 Path/File
Page 81 and 82:
GW-BASIC User's Guide Appendix C AS
Page 83 and 84:
GW-BASIC User's Guide Appendix D As
Page 85 and 86:
GW-BASIC User's Guide moved the cur
Page 87 and 88:
GW-BASIC User's Guide that the code
Page 89 and 90:
GW-BASIC User's Guide converted to
Page 91 and 92:
GW-BASIC User's Guide DEF USR State
Page 93 and 94:
GW-BASIC User's Guide USR Function
Page 95 and 96:
GW-BASIC User's Guide E.3 Multiple
Page 97 and 98:
GW-BASIC User's Guide 8 8 18 24 90
Page 99 and 100:
GW-BASIC User's Guide _ Underscore.
Page 101 and 102:
GW-BASIC User's Guide Data represen
Page 103 and 104:
GW-BASIC User's Guide binary system
Page 105 and 106:
GW-BASIC User's Guide computers or
Page 107 and 108:
GW-BASIC User's Guide double-precis
Page 109 and 110:
GW-BASIC User's Guide graphics A ha
Page 111 and 112:
GW-BASIC User's Guide precisely ref
Page 113 and 114:
GW-BASIC User's Guide An extra-bit
Page 115 and 116:
GW-BASIC User's Guide single-densit
Page 117 and 118:
GW-BASIC User's Guide ABS Function
Page 119 and 120:
GW-BASIC User's Guide CHR$ Function
Page 121 and 122:
GW-BASIC User's Guide AUTO Command
Page 123 and 124:
GW-BASIC User's Guide BLOAD Command
Page 125 and 126:
GW-BASIC User's Guide BSAVE Command
Page 127 and 128:
GW-BASIC User's Guide Note ● Valu
Page 129 and 130:
GW-BASIC User's Guide CDBL Function
Page 131 and 132:
GW-BASIC User's Guide INT Function
Page 133 and 134:
GW-BASIC User's Guide CHAIN Stateme
Page 135 and 136:
GW-BASIC User's Guide MERGE Command
Page 137 and 138:
GW-BASIC User's Guide CIRCLE Statem
Page 139 and 140: GW-BASIC User's Guide COLOR Stateme
Page 141 and 142: GW-BASIC User's Guide For more info
Page 143 and 144: GW-BASIC User's Guide EGA with Enha
Page 145 and 146: GW-BASIC User's Guide SCREEN 10 ●
Page 147 and 148: GW-BASIC User's Guide For various s
Page 149 and 150: GW-BASIC User's Guide PALETTE, PALE
Page 151 and 152: GW-BASIC User's Guide Enhanced d EG
Page 153 and 154: GW-BASIC User's Guide N Move, but r
Page 155 and 156: GW-BASIC User's Guide LINE Statemen
Page 157 and 158: GW-BASIC User's Guide LINE (0,0)-(1
Page 159 and 160: GW-BASIC User's Guide tile_length i
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
Page 171 and 172: GW-BASIC User's Guide CSRLIN Variab
Page 173 and 174: GW-BASIC User's Guide CVI, CVS, CVD
Page 175 and 176: GW-BASIC User's Guide DATA Statemen
Page 177 and 178: GW-BASIC User's Guide RESTORE State
Page 179 and 180: GW-BASIC User's Guide the value of
Page 181 and 182: GW-BASIC User's Guide DEFINT/SNG/DB
Page 183 and 184: GW-BASIC User's Guide DEF and SEG m
Page 185 and 186: GW-BASIC User's Guide POKE Statemen
Page 187 and 188: GW-BASIC User's Guide EDIT Command
Page 189: GW-BASIC User's Guide ENVIRON State
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
Page 207 and 208: GW-BASIC User's Guide FOR ... NEXT
Page 209 and 210: GW-BASIC User's Guide FRE Function
Page 211 and 212: GW-BASIC User's Guide The number of
Page 213 and 214: GW-BASIC User's Guide GOTO Statemen
Page 215 and 216: GW-BASIC User's Guide OCT$ Function
Page 217 and 218: GW-BASIC User's Guide Testing Equal
Page 219 and 220: GW-BASIC User's Guide 1070 TIMEOUT%
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
Page 229 and 230: GW-BASIC User's Guide ** A double a
Page 231 and 232: GW-BASIC User's Guide WIDTH Stateme
Page 233 and 234: GW-BASIC User's Guide INPUT# Statem
Page 235 and 236: GW-BASIC User's Guide 100 PRINT "TY
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
Page 251 and 252:
GW-BASIC User's Guide Makes the cur
Page 253 and 254:
GW-BASIC User's Guide It is expecte
Page 255 and 256:
GW-BASIC User's Guide LOG Function
Page 257 and 258:
GW-BASIC User's Guide MID$ Statemen
Page 259 and 260:
GW-BASIC User's Guide NAME Command
Page 261 and 262:
GW-BASIC User's Guide ON ERROR GOTO
Page 263 and 264:
GW-BASIC User's Guide ON ... GOSUB
Page 265 and 266:
GW-BASIC User's Guide reclen is an
Page 267 and 268:
GW-BASIC User's Guide ● Files may
Page 269 and 270:
GW-BASIC User's Guide RESET Command
Page 271 and 272:
GW-BASIC User's Guide Examples: The
Page 273 and 274:
GW-BASIC User's Guide when using GE
Page 275 and 276:
GW-BASIC User's Guide PCOPY Command
Page 277 and 278:
GW-BASIC User's Guide n = 5 Returns
Page 279 and 280:
GW-BASIC User's Guide . (period) A
Page 281 and 282:
GW-BASIC User's Guide PMAP Function
Page 283 and 284:
GW-BASIC User's Guide The following
Page 285 and 286:
GW-BASIC User's Guide If the string
Page 287 and 288:
GW-BASIC User's Guide PUT Statement
Page 289 and 290:
GW-BASIC User's Guide RANDOMIZE Sta
Page 291 and 292:
GW-BASIC User's Guide RND Function
Page 293 and 294:
GW-BASIC User's Guide . . . 129 FOR
Page 295 and 296:
GW-BASIC User's Guide RESUME Statem
Page 297 and 298:
GW-BASIC User's Guide RMDIR Command
Page 299 and 300:
GW-BASIC User's Guide SAVE Command
Page 301 and 302:
GW-BASIC User's Guide SGN Function
Page 303 and 304:
GW-BASIC User's Guide SOUND Stateme
Page 305 and 306:
GW-BASIC User's Guide SPACE$ Functi
Page 307 and 308:
GW-BASIC User's Guide SQR Function
Page 309 and 310:
GW-BASIC User's Guide STOP Statemen
Page 311 and 312:
GW-BASIC User's Guide VAL Function
Page 313 and 314:
GW-BASIC User's Guide STRIG(n) Stat
Page 315 and 316:
GW-BASIC User's Guide SYSTEM Comman
Page 317 and 318:
GW-BASIC User's Guide TAN Function
Page 319 and 320:
GW-BASIC User's Guide 08:00:05 The
Page 321 and 322:
GW-BASIC User's Guide TRON/TROFF Co
Page 323 and 324:
GW-BASIC User's Guide 0 1 Mode The
Page 325 and 326:
GW-BASIC User's Guide VARPTR$ Funct
Page 327 and 328:
GW-BASIC User's Guide The following
Page 329 and 330:
GW-BASIC User's Guide WAIT Statemen
Page 331 and 332:
GW-BASIC User's Guide WINDOW Statem
Page 333 and 334:
GW-BASIC User's Guide WRITE Stateme
show all

GWBASIC User's Manual

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?