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CLS ''' RULE #1 ' Always enter a FOR-NEXT loop at the FOR. Don’t even think about entering ' the middle of a loop. Not surprisingly, “there be dragons here” if you ' do. ' ' In ugBASIC you can enter into a FOR...NEXT without problems. PRINT "RULE#1" PRINT DIM x1 AS BYTE x1 = 1 GOTO inTheMiddle1 FOR x1 = 1 TO 10 inTheMiddle1: PRINT x1;" "; NEXT x1 PRINT ''' RULE #2 ' Never leave a FOR-NEXT mid-flight. Use FOR-NEXT to count from the ' beginning to the TO value with steps of STEP. If you feel you must ' leave a FOR in mid-flight, then FOR is not the proper construct. ' ' In ugBASIC you can exit out from a FOR...NEXT without problems. PRINT:PRINT "RULE #2" PRINT DIM x2 AS BYTE FOR x2 = 1 TO 10 PRINT x2;" "; IF x2 > 4 THEN GOTO outOfFor2 NEXT x2 outOfFor2: PRINT ''' RULE #3 ' If you absolutely must jump out of a FOR, then you must always ' come back to where you left off. The best way to do this is ' via GOSUB to jump out and then RETURN to where you were. ' At the location where you jump out, there should be no ' FORs with the same control variable, in this case i. ' ' In ugBASIC you can jump out using GOTO (see rules #1 and #2) ' and you can use the same variable if you jump inside a GOSUB. ''' RULE #4 ' Never enter a FOR loop recursively, unless you are using a modern ' BASIC, and even then use recursive subs/functions and not GOTOs ' or GOSUBS ' ' ugBASIC does not support recursion ''' RULE #5 ' Don’t try to change the final value or the step when a FOR-NEXT ' is in-flight. You may get away with this on some BASICs and ' not on others. ' ' In ugBASIC you can change initial, final and step value. PRINT:PRINT "RULE #5" PRINT DIM x5 AS BYTE, f5 AS BYTE, t5 AS BYTE, s5 AS BYTE f5 = 1: t5 = 10: s5 = 2 FOR x5 = f5 TO t5 STEP s5 PRINT x5; " "; IF x5 > 4 THEN t5 = 10 s5 = 4 ENDIF NEXT PRINT ''' RULE #6 ' Don’t change the control variable in-flight: ' ' In ugBASIC you can change the contro variable, as you like. PRINT:PRINT "RULE #6" PRINT DIM x6 AS BYTE FOR x6 = 1 TO 10 PRINT x6;" "; IF x6 > 3 THEN x6 = 10 NEXT PRINT ''' RULE #7 ' Draw a line from each FOR to the corresponding NEXT, and make ' sure no lines overlap, as depicted below: ' ' +-- for i = 1 to 10 ' | '+----|--------for j = 1 to 10 '+ | '+ +---next i '+ '+-------next j ' ' Also ugBASIC respects this rule.
Some examples: HELLO WORLD PARABOLA AND HYPERBOLA PRE-EMPTIVE PARALLEL COMPUTING

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