BASIC Tricks - Plus/4 Encyclopedia



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BASIC Tricks
Category Programming/BASIC Topic 1) IF A<>0 can be reduced to IF A (warning: this trick must not be applied with multiple variables, es. IF A% AND B%) 2) GOTO 0 can be reduced to GOTO. 3) ....: GOTO 1000: here any string as comment is accepted without a REM (also works with ....: RETURN) 3b) DATA ... , ... :here any string as comment is accepted without a REM 4) NEXT x,y can be entered as NEXT: NEXT (runs faster) 5) IF ... THEN GOTO 2000 can be reduced to IF ... THEN 2000 6) ? FRE(n) is useful to pack string area by eliminating old useless strings (not a real trick) 7) To check if a file is existing: "RENAME a$ TO a$" (a$=filename). Results DS=62 file does not exist; DS=63 file exists. 8) CHAR ,x,y,"[CLR]" to clear screen and cancel all possible windows (x,y any legal value) 9) "IF ev = 0 THEN e= -1: ELSE e = 0" can be reduced to: "e=ev=0" 10) Flip 0<->1 in a variable. "IF a%=1 then a%=0: ELSE a%=1" can be reduced to: "a%=abs(a%-1)" Credits SVS