Vb.net VB:如果变量是其他变量?
我只是在学习visualbasic。我试着做一个计算器,但是我想要它,所以如果你还有什么不在if语句中的东西,它会说“对不起”,然后返回到开头。代码如下:Vb.net VB:如果变量是其他变量?,vb.net,Vb.net,我只是在学习visualbasic。我试着做一个计算器,但是我想要它,所以如果你还有什么不在if语句中的东西,它会说“对不起”,然后返回到开头。代码如下: Module Module1 Sub Main() Dim num1 As Integer Dim num2 As Integer Dim op As String Console.WriteLine("Calculator") Console.WriteLine(" ") Console
Module Module1
Sub Main()
Dim num1 As Integer
Dim num2 As Integer
Dim op As String
Console.WriteLine("Calculator")
Console.WriteLine(" ")
Console.WriteLine("Valid Operators :")
Console.WriteLine("+(Addition), -(Subtraction), *(Multiplication) & /(Division)")
Console.WriteLine(" ")
Console.WriteLine("Enter Number 1 :")
num1 = Console.ReadLine()
Console.WriteLine(" ")
Console.WriteLine("Enter Number 2 :")
num2 = Console.ReadLine()
Console.WriteLine(" ")
Console.WriteLine("Enter Operator :")
op = Console.ReadLine()
If op = "+" Then
Console.WriteLine(" ")
Console.WriteLine("Answer :")
Console.WriteLine(num1 + num2)
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
End If
If op = "-" Then
Console.WriteLine(" ")
Console.WriteLine("Answer :")
Console.WriteLine(num1 - num2)
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
End If
If op = "*" Then
Console.WriteLine(" ")
Console.WriteLine("Answer :")
Console.WriteLine(num1 * num2)
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
End If
If op = "/" Then
Console.WriteLine(" ")
Console.WriteLine("Answer :")
Console.WriteLine(num1 / num2)
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
End If
If op = Nothing Then
Console.WriteLine(" ")
Console.WriteLine("You have not entered a valid operator.")
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
End If
End Sub
End Module
模块1
副标题()
作为整数的Dim num1
作为整数的Dim num2
作为字符串的Dim op
控制台写入线(“计算器”)
控制台写入线(“”)
Console.WriteLine(“有效运算符:”)
Console.WriteLine(“+(加法),-(减法),*(乘法)和/(除法)”)
控制台写入线(“”)
Console.WriteLine(“输入数字1:”)
num1=Console.ReadLine()
控制台写入线(“”)
Console.WriteLine(“输入数字2:”)
num2=Console.ReadLine()
控制台写入线(“”)
Console.WriteLine(“输入运算符:”)
op=Console.ReadLine()
如果op=“+”则
控制台写入线(“”)
Console.WriteLine(“答案:”)
控制台写入线(num1+num2)
控制台写入线(“”)
控制台写入线(“按下退出”)
Console.ReadLine()
如果结束
如果op=“-”则
控制台写入线(“”)
Console.WriteLine(“答案:”)
控制台写入线(num1-num2)
控制台写入线(“”)
控制台写入线(“按下退出”)
Console.ReadLine()
如果结束
如果op=“*”则
控制台写入线(“”)
Console.WriteLine(“答案:”)
控制台写入线(num1*num2)
控制台写入线(“”)
控制台写入线(“按下退出”)
Console.ReadLine()
如果结束
如果op=“/”则
控制台写入线(“”)
Console.WriteLine(“答案:”)
控制台写入线(num1/num2)
控制台写入线(“”)
控制台写入线(“按下退出”)
Console.ReadLine()
如果结束
如果op=Nothing,则
控制台写入线(“”)
Console.WriteLine(“您没有输入有效的运算符。”)
控制台写入线(“”)
控制台写入线(“按下退出”)
Console.ReadLine()
如果结束
端接头
端模块
有人能帮忙吗?您可以这样命名您的线路:
Line1:
然后在代码中,您可以使用以下内容:
Goto Line1
仅供参考,如果我不告诉你,我会被否决,这不应该做,因为这是一个坏习惯 您正在查找switch语句(
在VB中选择Case
)。所有空的WriteLine
语句也不是必需的
Module Module1
Sub Main()
Dim finished As Boolean = False
While Not finished
Dim num1 As Integer
Dim num2 As Integer
Dim op As String
Console.WriteLine("Calculator" & Environment.Newline)
Console.WriteLine("Valid Operators :")
Console.WriteLine("+(Addition), -(Subtraction), *(Multiplication) & /(Division)" & Environment.Newline)
Console.WriteLine("Enter Number 1 :")
num1 = Console.ReadLine()
Console.WriteLine(Environment.Newline & "Enter Number 2 :")
num2 = Console.ReadLine()
Console.WriteLine(Environment.Newline & "Enter Operator :")
op = Console.ReadLine()
Select Case op
Case "+"
Console.WriteLine(Environment.Newline & "Answer :")
Console.WriteLine((num1 + num2) & Environment.Newline)
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
finished = True
Case "-"
Console.WriteLine(Environment.Newline & "Answer :")
Console.WriteLine(num1 - num2 & Environment.Newline)
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
finished = True
Case"*"
Console.WriteLine(Environment.Newline & "Answer :")
Console.WriteLine((num1 * num2) & Environment.Newline)
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
finished = True
Case "/"
Console.WriteLine(Environment.Newline & "Answer :")
Console.WriteLine((num1 / num2) & Environment.Newline)
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
finished = True
Case Is Nothing
Console.WriteLine(Environment.Newline & "You have not entered a valid operator." & Environment.Newline)
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
Case Else
Console.WriteLine(Environment.Newline & "Sorry." & Environment.Newline)
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
End Select
End While
End Sub
End Module
模块1
副标题()
Dim结束为布尔值=False
虽然还没有完成
作为整数的Dim num1
作为整数的Dim num2
作为字符串的Dim op
Console.WriteLine(“Calculator”和Environment.Newline)
Console.WriteLine(“有效运算符:”)
Console.WriteLine(“+(加法),-(减法),*(乘法)和/(除法)”和Environment.Newline)
Console.WriteLine(“输入数字1:”)
num1=Console.ReadLine()
Console.WriteLine(Environment.Newline&“输入数字2:”)
num2=Console.ReadLine()
Console.WriteLine(Environment.Newline&“输入运算符:”)
op=Console.ReadLine()
选择案例op
大小写“+”
Console.WriteLine(Environment.Newline&“Answer:”)
Console.WriteLine((num1+num2)和Environment.Newline)
控制台写入线(“按下退出”)
Console.ReadLine()
完成=正确
案例“-”
Console.WriteLine(Environment.Newline&“Answer:”)
Console.WriteLine(num1-num2和Environment.Newline)
控制台写入线(“按下退出”)
Console.ReadLine()
完成=正确
案例“*”
Console.WriteLine(Environment.Newline&“Answer:”)
Console.WriteLine((num1*num2)和Environment.Newline)
控制台写入线(“按下退出”)
Console.ReadLine()
完成=正确
案例“/”
Console.WriteLine(Environment.Newline&“Answer:”)
Console.WriteLine((num1/num2)和Environment.Newline)
控制台写入线(“按下退出”)
Console.ReadLine()
完成=正确
这个案子不算什么
Console.WriteLine(Environment.Newline&“您没有输入有效的运算符。”&Environment.Newline)
控制台写入线(“按下退出”)
Console.ReadLine()
其他情况
Console.WriteLine(Environment.Newline和“Sorry.”和Environment.Newline)
控制台写入线(“按下退出”)
Console.ReadLine()
结束选择
结束时
端接头
端模块
我将在Do循环中使用Select case语句来解决这个问题,因此在您的代码中,在执行之前:
Console.WriteLine("Enter Number 1 :")
我想补充一点
Do
在最后,在最后一个if语句之前,我将添加
Loop
因此,这将产生“回到开始”的效果
在最后一个if语句中,我会这样做
Exit Do
如果符合退出条件。(执行将转到Loop命令后的第一行)
。
.
.
做
选择案例op
大小写“+”
控制台写入线(“”)
Console.WriteLine(“答案:”)
控制台写入线(num1+num2)
控制台写入线(“”)
控制台写入线(“按下退出”)
Console.ReadLine()
案例“-”
控制台写入线(“”)
Console.WriteLine(“答案:”)
控制台写入线(num1-num2)
控制台写入线(“”)
控制台写入线(“按下退出”)
Console.ReadLine()
案例“*”
控制台写入线(“”)
Console.WriteLine(“答案:”)
控制台写入线(num1*num2)
控制台写入线(“”)
控制台写入线(“按下退出”)
Console.ReadLine()
案例“/”
控制台写入线(“”)
Console.WriteLine(“答案:”)
控制台写入线(num1/num2)
控制台写入线(“”)
控制台写入线(“按下退出”)
Console.ReadLine()
这个案子不算什么
控制台写入线(“”)
Console.WriteLine(“您没有输入有效的运算符。”)
控制台写入线(“”)
控制台写入线(“按下退出”)
exit=Console.ReadLin
.
.
.
Do
Select Case op
Case "+"
Console.WriteLine(" ")
Console.WriteLine("Answer :")
Console.WriteLine(num1 + num2)
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
Case "-"
Console.WriteLine(" ")
Console.WriteLine("Answer :")
Console.WriteLine(num1 - num2)
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
Case"*"
Console.WriteLine(" ")
Console.WriteLine("Answer :")
Console.WriteLine(num1 * num2)
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
Case "/"
Console.WriteLine(" ")
Console.WriteLine("Answer :")
Console.WriteLine(num1 / num2)
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
Case Is Nothing
Console.WriteLine(" ")
Console.WriteLine("You have not entered a valid operator.")
Console.WriteLine(" ")
Console.WriteLine("Press <Enter> To Exit")
exit = Console.ReadLine()
//test here for exit and if exit do:
Exit Do
Case Else
Console.WriteLine("Sorry")
Console.WriteLine("Press <Enter> To Exit")
Console.ReadLine()
End Select
Loop