How to simulate a coin flip with While... Wend and Do... Until?

Develop a solution to flip a coin a given amount of times and then print the number of heads and the number of tail. The equation to toss the coin is

Coin = Integer(random*2) + 1

When Coin = 1 the toss is heads, and when Coin = 2 the toss is tails.

Random returns a number between 0 and 1, including 0, but not 1.

Therefore, when random is less than 0.5, Coin will equal 1; and when random is greater than or equal to 0.5 and less than 1, Coin will equal 2.

Structure: While... wend and Do... Until

I've done For Next structure, but I have trouble turning it into those structures.

Dim flips As Integer, heads As Integer, tails As Integer, i As Integer
heads = 0
tails = 0 
flips = InputBox("How many flips?") + 0
For i = 1 To flips
    If (Rnd * 2) + 1 >= 0.5 And (Rnd * 2) < 1 Then
        tails = tails + 1
    Else 
        heads = heads + 1
    End If
Next i 
MsgBox (heads & " heads, " & tails & " tails.")

Solution

Loops

The principle

' For
For i = 1 To flips
    '...
Next i

' While
i = 0 ' by default
While i < flips
    i = i + 1
    '...
Wend

' Do (1)
i = 0 ' by default
Do Until i = flips
    i = i + 1
    '...
Loop


' Do (2)
i = 0 ' by default
Do
    i = i + 1
    '...
Loop Until i = flips

Applied

Sub flipsFor()
    Dim flips As Integer, heads As Integer, tails As Integer, i As Integer
    heads = 0
    tails = 0
    flips = InputBox("How many flips?") + 0
    ' For
    For i = 1 To flips
        If (Rnd * 2) + 1 >= 0.5 And (Rnd * 2) < 1 Then
            tails = tails + 1
        Else
            heads = heads + 1
        End If
    Next i
    MsgBox (heads & " heads, " & tails & " tails.")
End Sub
Sub flipsWhile()
    Dim flips As Integer, heads As Integer, tails As Integer, i As Integer
    heads = 0
    tails = 0
    flips = InputBox("How many flips?") + 0
    ' While
    i = 0 ' by default
    While i < flips
        i = i + 1
        If (Rnd * 2) + 1 >= 0.5 And (Rnd * 2) < 1 Then
            tails = tails + 1
        Else
            heads = heads + 1
        End If
    Wend
    MsgBox (heads & " heads, " & tails & " tails.")
End Sub

Sub flipsDo1()
    Dim flips As Integer, heads As Integer, tails As Integer, i As Integer
    heads = 0
    tails = 0
    flips = InputBox("How many flips?") + 0
    ' Do (1)
    i = 0 ' by default
    Do Until i = flips
        i = i + 1
        If (Rnd * 2) + 1 >= 0.5 And (Rnd * 2) < 1 Then
            tails = tails + 1
        Else
            heads = heads + 1
        End If
    Loop
    MsgBox (heads & " heads, " & tails & " tails.")
End Sub

Sub flipsDo2()
    Dim flips As Integer, heads As Integer, tails As Integer, i As Integer
    heads = 0
    tails = 0
    flips = InputBox("How many flips?") + 0
    ' Do (2)
    i = 0 ' by default
    Do
        i = i + 1
        If (Rnd * 2) + 1 >= 0.5 And (Rnd * 2) < 1 Then
            tails = tails + 1
        Else
            heads = heads + 1
        End If
    Loop Until i = flips
    MsgBox (heads & " heads, " & tails & " tails.")
End Sub