当一个人提供与物品价格相同数量的现金时，试图打印 0 值

Question

基本上当我不通过我的 CashedOwed 变量传递 ##.## 时，它会显示 $0.000。如果我这样做，那么它将打印为金钱符号，但后面没有数字。

我不确定如何修复它，或者我还能做什么。老实说，我已经为此工作了几个小时，并且已经使用我正在创建的程序完成了许多 bugs/issues/concepts（这是我在大学时的编程 class。）

'Service number variable
Dim snum As String

'Haircut description variables. Variable names are acronymns of the hair styles
Dim str_mdc As String = "Men's dry cut"
Dim str_mwc As String = "Men's wash and cut"
Dim str_lwcb As String = "Ladies wash, cut & blow dry"
Dim str_lccs As String = "Ladies color, cut & style"
Dim str_lcfcs As String = "Ladies color, foils, cut & style"
Dim hairstyle As String

'If person is 65 or older variable
Dim seniordisc As String


'How much cash is given towards the haircut variable
Dim cashpaid As Decimal
Dim cash As Decimal

'Prices variables, which then store in the price variable when it's selected in the case
Dim price1 As Decimal = 18.75
Dim price2 As Decimal = 29.5
Dim price3 As Decimal = 38.75
Dim price4 As Decimal = 79.8
Dim price5 As Decimal = 95.5
Dim price As Decimal

'calculation variables
Dim haircutprice As Decimal
Dim tax As Decimal = 1.15
Dim TotalWithTax As Decimal
Dim discount As Decimal = 1.15
Dim CashOwed As Double
Sub Main()

    'initializes the console and variables.
    Console.Clear()

    'Prints out the menu for Sally's Shear Delight
    Console.WriteLine("----------------------------------------------------------")
    Console.WriteLine("Sally’s Shear Delight")
    Console.WriteLine("----------------------------------------------------------")
    Console.WriteLine("Service Number | Description                      | Price")
    Console.WriteLine("----------------------------------------------------------")
    Console.WriteLine($"1              | {str_mdc}                    | ${price1}")
    Console.WriteLine($"2              | {str_mwc}               | ${price2}")
    Console.WriteLine($"3              | {str_lwcb}      | ${price3}")
    Console.WriteLine($"4              | {str_lccs}        | ${price4}")
    Console.WriteLine($"5              | {str_lcfcs} | ${price5}")

    'Writes a line in the console, prompting user to input service number
    Console.WriteLine($"{vbCrLf}Enter the number of which service is required.")
    snum = Console.ReadLine 'stores the value inside of the variable

    Select Case snum
        Case "1"
            'haircut style
            str_mdc = "Men's dry cut"
            'prompts the user with a y/n option. returns to main if they hit something else
            Console.WriteLine("Is the customer 65 or older? y/n")
            seniordisc = Console.ReadLine
        Case "2"
            'haircut style
            str_mwc = "Men's wash and cut"
            'prompts the user with a y/n option. returns to main if they hit something else
            Console.WriteLine("Is the customer 65 or older? y/n")
            seniordisc = Console.ReadLine
        Case "3"
            'haircut style
            str_lwcb = "Ladies wash, cut & blow dry"
            'prompts the user with a y/n option. returns to main if they hit something else
            Console.WriteLine("Is the customer 65 or older? y/n")
            seniordisc = Console.ReadLine
            'prompts user to enter the amount of cash given
            Console.WriteLine("Enter amount of cash given")
            cash = Console.ReadLine
        Case "4"
            'haircut style
            str_lccs = "Ladies color, cut & style"
            'prompts the user with a y/n option. returns to main if they hit something else
            Console.WriteLine("Is the customer 65 or older? y/n")
            seniordisc = Console.ReadLine
            'prompts user to enter the amount of cash given
        Case "5"
            'haircut style
            str_lcfcs = "Ladies color, foils, cut & style"
            'prompts the user with a y/n option. returns to main if they hit something else
            Console.WriteLine("Is the customer 65 or older? y/n")
            seniordisc = Console.ReadLine
        Case Else
            Main()
    End Select

    Select Case snum
        Case "1"
            price = price1
        Case "2"
            price = price2
        Case "3"
            price = price3
        Case "4"
            price = price4
        Case "5"
            price = price5
    End Select

    Select Case snum
        Case "1"
            hairstyle = str_mdc
        Case "2"
            hairstyle = str_mwc
        Case "3"
            hairstyle = str_lwcb
        Case "4"
            hairstyle = str_lccs
        Case "5"
            hairstyle = str_lcfcs
    End Select

    Select Case seniordisc
        Case "y"

            haircutprice = price
            discount = (price / 10) * 2
            TotalWithTax = (haircutprice - discount) * tax
            Console.WriteLine($"{vbCrLf}The total is: ${TotalWithTax:##.##}")
            Console.WriteLine($"{vbCrLf}Enter amount of cash given")
            cash = Console.ReadLine
            CashOwed = cash - TotalWithTax
            Console.WriteLine($"{vbCrLf}----------------------------------------------------------")
            Console.WriteLine("Sally’s Shear Delight")
            Console.WriteLine($"{vbCrLf}RECEIPT")
            Console.WriteLine($"----------------------------------------------------------")
            Console.WriteLine($"Haircut Style: {hairstyle}")
            Console.WriteLine($"Price of haircut: ${price}")
            Console.WriteLine($"Senior's discount: {discount:##.##}")
            Console.WriteLine($"Total amount after discount: {TotalWithTax:##.##}")
            Console.WriteLine($"Amount paid: ${cash:##.##}")
            Console.WriteLine($"Cash owed: ${CashOwed}")

        Case "n"
            haircutprice = price
            TotalWithTax = (haircutprice * tax)
            Console.WriteLine($"{vbCrLf}The total is: ${TotalWithTax:##.##}")
            Console.WriteLine($"{vbCrLf}Enter amount of cash given")
            cash = Console.ReadLine
            CashOwed = cash - TotalWithTax
            Console.WriteLine($"{vbCrLf}----------------------------------------------------------")
            Console.WriteLine("Sally’s Shear Delight")
            Console.WriteLine($"{vbCrLf}RECEIPT")
            Console.WriteLine($"----------------------------------------------------------")
            Console.WriteLine($"Haircut Style: {hairstyle}")
            Console.WriteLine($"Price of haircut: ${price}")
            Console.WriteLine($"Total amount: {TotalWithTax:##.##}")
            Console.WriteLine($"Amount paid: ${cash:##.##}")
            Console.WriteLine($"Cash owed: ${CashOwed}")
        Case Else
            Main()
    End Select
    Console.ReadKey()
End Sub

Answer 1

对于要格式化为货币的每个值，您可以删除前面的美元符号并执行如下操作。

Console.WriteLine($"Cash Owed {CashOwed:C2}")

C2 将格式化为带 2 个小数位的货币

当一个人提供与物品价格相同数量的现金时，试图打印 0 值

Trying to print a 0 value when a person gives the same amount of cash as what the price of the item is

vb.net

console-application