CODEWITHSUNDEEP
vb.netconsole-application
Joshua Paulsen
Joshua Paulsen

Reputation: 57

Change a For Loop to a Do While statement?

Module Module1 
   Sub Main() 
      For value As Integer = 9 To 0 'Step 1'
         System.Console.WriteLine(value) 
      Next 
   End Sub 
End Module

This should be simple id imagine, how could this easily be changed from a "For Loop" to a "Do While" statement?

Upvotes: 1

Views: 474

Answers (2)

Sebastian Brosch
Sebastian Brosch

Reputation: 43574

You can use the following Do While loop instead:

Dim value As Integer = 9

Do While value <= 9 And value >= 0
    Console.WriteLine(value)
    value -= 1 'this count from 9 to 0
Loop

But your For doesn't work this way. At the moment you For loop doesn't output any value. It looks like you set the wrong steps:

For value As Integer = 9 To 0 Step -1
    Console.WriteLine(value) 'this count from 9 to 0
Next

The Do While loop solution to count from 0 to 9:

Dim value As Integer = 0

Do While value <= 9 And value >= 0
    Console.WriteLine(value)
    value += 1 'this count from 0 to 9
Loop

The For loop solution to count from 0 to 9:

For value As Integer = 0 To 9 Step 1
    Console.WriteLine(value) 'this count from 0 to 9
Next

Upvotes: 1

Bal&#225;zs Kovacsics
Bal&#225;zs Kovacsics

Reputation: 701

This will never enter the loop, as the start value is higher than the end, and the step is not negative. See here: https://learn.microsoft.com/en-us/dotnet/visual-basic/language-reference/statements/for-next-statement#technical-implementation To turn this into a Do-While, you would have to first check if the start and end conditions are valid, otherwise it would be stuck in an infinite loop.

Upvotes: 0

Related Questions