GWBASIC User's Manual

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GW-BASIC <strong>User's</strong> Guide 480 REM ADD TO STOCK 490 GOSUB 840 500 IF ASC(F$)=255 THEN PRINT "NULL ENTRY":RETURN 510 PRINT D$:INPUT "QUANTITY TO ADD";A% 520 Q%=CVI(Q$)+A% 530 LSET Q$=MKI$(Q%) 540 PUT#1,PART% 550 RETURN 560 REM REMOVE FROM STOCK 570 GOSUB 840 580 IF ASC(F$)=255 THEN PRINT "NULL ENTRY":RETURN 590 PRINT D$ 600 INPUT "QUANTITY TO SUBTRACT";S% 610 Q%=CVI(Q$) 620 IF (Q%-S%) "Y" THEN RETURN 920 LSET F$=CHR$(255) 930 FOR I=1 TO 100 940 PUT#1,I 950 NEXT I 960 RETURN file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/Chapter%205.html (9 of 9)28/03/2004 21.29.02
GW-BASIC <strong>User's</strong> Guide Appendix A Error Codes and Messages Code Message 1 NEXT without FOR NEXT statement does not have a corresponding FOR statement. Check variable at FOR statement for a match with the NEXT statement variable. 2 Syntax error A line is encountered that contains an incorrect sequence of characters (such as unmatched parentheses, a misspelled command or statement, incorrect punctuation). This error causes GW-BASIC to display the incorrect line in edit mode. 3 RETURN without GOSUB A RETURN statement is encountered for which there is no previous GOSUB statement. 4 Out of DATA A READ statement is executed when there are no DATA statements with unread data remaining in the program. 5 Illegal function call An out-of-range parameter is passed to a math or string function. An illegal function call error may also occur as the result of: 6 Overflow ● a negative or unreasonably large subscript ● a negative or zero argument with LOG ● a negative argument to SQR ● a negative mantissa with a noninteger power ● a call to a USR function for which the starting address has not yet been given ● an improper argument to MID$, LEFT$, RIGHT$, INP, OUT, WAIT, PEEK, POKE, TAB, SPC, STRING$, SPACE$, INSTR, or ON...GOTO The result of a calculation is too large to be represented in GW-BASIC's number format. If underflow occurs, the result is zero, and execution continues without an error. 7 Out of memory A program is too large, has too many FOR loops, GOSUBs, variables, or expressions that are too complicated. Use the CLEAR statement to set aside more stack space or memory area. file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/Appendix%20A.html (1 of 7)28/03/2004 21.29.03
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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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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 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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GW-BASIC User's Guide POKE Statemen
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GW-BASIC User's Guide EDIT Command
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GW-BASIC User's Guide ENVIRON State
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GW-BASIC User's Guide ENVIRON$ Func
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GW-BASIC User's Guide SHELL Stateme
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GW-BASIC User's Guide EOF Function
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GW-BASIC User's Guide ERDEV and ERD
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GW-BASIC User's Guide ERROR Stateme
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GW-BASIC User's Guide EXP Function
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GW-BASIC User's Guide FIELD Stateme
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GW-BASIC User's Guide GET Statement
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GW-BASIC User's Guide FOR ... NEXT
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GW-BASIC User's Guide FRE Function
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GW-BASIC User's Guide The number of
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GW-BASIC User's Guide GOTO Statemen
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GW-BASIC User's Guide OCT$ Function
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GW-BASIC User's Guide Testing Equal
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GW-BASIC User's Guide 1070 TIMEOUT%
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GW-BASIC User's Guide INPUT Stateme
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GW-BASIC User's Guide PRINT Stateme
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GW-BASIC User's Guide STRING$ Funct
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GW-BASIC User's Guide PRINT USING S
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GW-BASIC User's Guide ** A double a
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GW-BASIC User's Guide WIDTH Stateme
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GW-BASIC User's Guide INPUT# Statem
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GW-BASIC User's Guide 100 PRINT "TY
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GW-BASIC User's Guide IOCTL Stateme
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GW-BASIC User's Guide KILL Command
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GW-BASIC User's Guide MID$ Function
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GW-BASIC User's Guide LEN FUNCTION
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GW-BASIC User's Guide LINE INPUT# S
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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 RESET Command
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GW-BASIC User's Guide Examples: The
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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 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 VARPTR$ Funct
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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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