FormatNumber [VBA]

        FormatNumber( expression As Variant, [numDigitsAfterDecimal As Integer], [includeLeadingDigit As Integer], _
            [useParensForNegativeNumbers As Integer], [groupDigits As Integer] ) As String
    

        Sub TestFormatNumber
        testName = "Test 1: positive, 2 decimals"
        str2 = "12.20"
        str1 = FormatNumber("12.2", 2, vbFalse, vbFalse, vbFalse)
        msgbox( "FormatNumber returned: " + str1 + ", Expected: " + str2)

        testName = "Test 2: negative, 20 decimals, use leading zero"
        str2 = "-0.20000000000000000000"
        str1 = FormatNumber("-.2", 20, vbTrue, vbFalse, vbFalse)
        msgbox( "FormatNumber returned: " + str1 + ", Expected: " + str2)

        testName = "Test 3: negative, 20 decimals, no leading zero"
        str2 = "-.20000000000000000000"
        str1 = FormatNumber("-0.2", 20, vbFalse, vbFalse, vbFalse)
        msgbox( "FormatNumber returned: " + str1 + ", Expected: " + str2)

        testName = "Test 4: negative, no leading zero, use parens"
        str2 = "(.20)"
        str1 = FormatNumber("-0.2", -1, vbFalse, vbTrue, vbFalse)
        msgbox( "FormatNumber returned: " + str1 + ", Expected: " + str2)

        testName = "Test 5: negative, default leading zero, use parens"
        str2 = "(0.20)"
        str1 = FormatNumber("-0.2", -1, vbUseDefault, vbTrue, vbFalse)
        msgbox( "FormatNumber returned: " + str1 + ", Expected: " + str2)

        testName = "Test 6: group digits"
        str2 = "-12,345,678.00"
        str1 = FormatNumber("-12345678", -1, vbUseDefault, vbUseDefault, vbTrue)
        msgbox( "FormatNumber returned: " + str1 + ", Expected: " + str2)
        End Sub