Programming Fundamentals/Loops/BASIC

loops.bas

' This program demonstrates While, Do, and For loop counting using 
' user-designated start, stop, and increment values.
'
' References:
'     https://en.wikibooks.org/wiki/BASIC_Programming

DECLARE SUB Main()
DECLARE FUNCTION GetValue(Name$)
DECLARE SUB WhileLoop(Start, Finish, Increment)
DECLARE SUB DoLoop(Start, Finish, Increment)
DECLARE SUB ForLoop(Start, Finish, Increment)

Main

SUB Main()
    DIM Start
    DIM Finish
    DIM Increment

    Start = GetValue("starting")
    Finish = GetValue("ending")
    Increment = GetValue("increment")

    WhileLoop Start, Finish, Increment
    DoLoop Start, Finish, Increment
    ForLoop Start, Finish, Increment
END SUB


FUNCTION GetValue(Name$)
    DIM Value
    
    PRINT "Enter " + Name$ + " value:"
    INPUT Value
    
    GetValue = Value
END FUNCTION

SUB WhileLoop(Start, Finish, Increment)
    PRINT "While loop counting from " + STR$(Start) + " to ";
    PRINT STR$(Finish) + " by " + STR$(Increment) + ":"
    DIM Count
    
    Count = Start
    DO WHILE Count <= Finish
        PRINT Count
        Count = Count + Increment
    LOOP
END SUB

SUB DoLoop(Start, Finish, Increment)
    PRINT "Do loop counting from " + STR$(Start) + " to ";
    PRINT STR$(Finish) + " by " + STR$(Increment) + ":"
    DIM Count
    
    Count = Start
    DO
        PRINT Count
        Count = Count + Increment
    LOOP WHILE Count <= Finish
END SUB

SUB ForLoop(Start, Finish, Increment)
    PRINT "For loop counting from " + STR$(Start) + " to ";
    PRINT STR$(Finish) + " by " + STR$(Increment) + ":"
    DIM Count
    
    FOR Count = Start TO Finish STEP Increment
        PRINT Count
    NEXT Count
END SUB

Try It

Copy and paste the code above into one of the following free online development environments or use your own BASIC compiler / interpreter / IDE.

• repl.it

See Also

• Wikibooks: BASIC Programming

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