by Trent Jackson (1 Submission)
Category: Math/Dates
Compatability: Visual Basic 5.0
Difficulty: Unknown Difficulty
Originally Published: Wed 17th May 2006
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Decimal to binary calc. This one works. 8 BIT BCD output string from dec value input. Could be expanded to allow for 10, 12, or even higher
API Declarations
'8 BIT Decimal To Binary String Calc
Rem By Trent Jackson 17/05/06
Rem v0.1 using Visual Basic 5
Rem Free to use & learn from
'decs
Dim IntBuff, CheckSum As Integer
Dim BinVal, StrBuff, DecVal As String
VBcoders
'----------
PromptUser:
'----------
'get dec val from user
DecVal = InputBox("Decimal num to convert?", "Input")
'------------------------------
'ensure that it's a valid input
'------------------------------
'check length
If Len(DecVal) > 3 Then
'tell user that the string has exceeded max length
IntBuff = MsgBox("8 BIT conversion only, max of three digits allowed", _
vbOKOnly, "Dec to Bin Calc")
'start again
GoTo PromptUser
Else
'make sure no other chr's except 0-9 exist
'scan string and compare with check sum
For IntBuff = 1 To Len(DecVal)
StrBuff = Mid$(DecVal, IntBuff, 1)
For CheckSum = 48 To 57
'compare val with checksum ascii chr's 0-9
If StrBuff = Chr(CheckSum) Then GoTo ChrOK 'match?, check next chr
Next CheckSum
'read entire string input with no invalid chr's found?
If IntBuff > Len(DecVal) Then GoTo ConvertToBin
'tell user that the string has an invalid chr
IntBuff = MsgBox("Invalid character, 0-9 only allowed", _
vbOKOnly, "Dec to Bin Calc")
'start again since the input value was invalid
GoTo PromptUser
'check next
ChrOK: Next IntBuff
End If
'------------
ConvertToBin:
'------------
'---------------------------------------------
Rem BIT weight; 128 64 32 16 8 4 2 1
Rem MSB--------------LSB
'---------------------------------------------
Rem 1 = set, true, 1
Rem 0 = not, false 0
'---------------------------------------------
'convert the aquired decimal value to integer
Static CheckByte As Integer
'copy val to check byte
CheckByte = DecVal
'null output bin string first
BinStr = "00000000"
'test with LSB first
IntBuff = 1
'use AND operartor to check which bits are on
Do While IntBuff <> 256 'loop until all 8 bits have been compared with
'select case is much more efficient than using IF's
Select Case CheckByte And IntBuff
Case 1
Mid$(BinStr, 8, 1) = "1"
Case 2
Mid$(BinStr, 7, 1) = "1"
Case 4
Mid$(BinStr, 6, 1) = "1"
Case 8
Mid$(BinStr, 5, 1) = "1"
Case 16
Mid$(BinStr, 4, 1) = "1"
Case 32
Mid$(BinStr, 3, 1) = "1"
Case 64
Mid$(BinStr, 2, 1) = "1"
Case 128
Mid$(BinStr, 1, 1) = "1"
End Select
IntBuff = IntBuff * 2 'inc bit weight for comparision
Loop
'notify user with results
IntBuff = MsgBox("Decimal value of " + DecVal + " = '" + BinStr + _
"'" + " in binary" + _
Chr$(13) + Chr$(13) + "Convert another value?." _
, vbYesNo, "Dec to Bin Calc")
'user wants to convert another value?
If IntBuff = vbYes Then
GoTo PromptUser
Else
End
End If
End Sub
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