无法将类型'bool'隐式转换为'int' [英] Cannot implicitly convert type 'bool' to 'int'

问题描述

嗨 我收到一个错误:
无法将类型"bool"隐式转换为"int"
无论如何，程序都会执行错误，但是我不知道如何解决.
这是代码段:

Hi I get an error:
Cannot implicitly convert type ''bool'' to ''int''
anyway the program executes with the errors but I dont know how to fix it.
Here is the code snippet:

// switch on the value of inputInt
                switch (inputInt)
                {
                    case (inputInt == 0):
                        Console.WriteLine("your input is zero.");
                        goto repeat;
                    case (inputInt % 2 != 0):
                        Console.WriteLine("your input is odd.");
                        goto repeat;
                    case (inputInt % 2 == 0):
                        Console.WriteLine("your input is even.");
                        goto repeat;
                    case (inputInt % 10 == 0):
                        Console.WriteLine("your bla bla..");
                        goto repeat;
                    case (inputInt > 100):
                        Console.WriteLine("your input is bla bla..");
                        goto repeat;
                }

我不明白这是什么问题.我们不能在案例陈述中加入公式和方程式吗?
最好的问候

这是学校的作业.
第一个任务是使用if-else语句执行此操作，没关系.
第二项任务是使用switch语句执行相同的程序...
这将是更多的代码，仅通过switch语句即可完成.

否则，我也不认为在这里使用switch语句会很有效.
任务本身:

1.创建一个程序来提示用户输入，接受一个整数，然后通过使用多个" if来评估该输入是零，奇数还是偶数，10的倍数或太大(大于100) "声明."

2.重写上一个练习中的程序，以使用switch语句完成相同的工作...

-------------------------------------------------- ---------------

为什么要嵌套它们?

我没有想到必须使用switch语句输出的方法.
例如10的倍数也是偶数.
所以必须要控制台输出会很高兴:
数字是10的倍数"
数字是偶数"
但是我今天真的很无聊，我怀疑只使用switch语句，甚至嵌套语句是不可能的.

I do not understand what is the problem. Can''t we have formulas and equations into the case statement?
Best regards

It is a schools assignment.
Task number one was to do this using if-else statements, it is ok.
Task number two is to do the same program, using a switch statement...
It is going to be more code, just to accomplish it with a switch statement.

Otherwise I also don''t thing it is efficient to use a switch statement here.
The tasks themselves:

1. "Create a program that prompts user for an input, accepts an integer, then evaluates whether that input is zero, odd or even, a multiple of 10, or too large (more than 100) by using multiple levels of ''if'' statements."

2."Rewrite the the program from the previous exercise to do the same work with a switch statement...

-----------------------------------------------------------------

why do you nest them?

i wast thinking of a way to have to outputs with a switch statement.
for example a number that is multiple of 10 is also an even number.
so it is gonna be nice to have to console outputs:
"the num is multiple of 10"
"the num is even"
but i got realy bored for today, and I suspect it is not possible only with a switch statements, even nested ones.

推荐答案

您的代码太不正确了！
如果inputInt是int，则case值应为int const s，例如:0，1，10 ...，而不是bool(> false)表达式.

Your code is soooo wrong!
If inputInt is an int, then the case values should be int consts, ex: 0, 1, 10..., not bool (true of false) expressions.

Toli完全正确.告诉您的switch语句评估Int.将开关视为更容易编写的If Then语句系列.在您的情况下，它等于:

Toli is exactly right. Your switch statement is told to evaluate an Int. Think of the switch as an easier to write series of If Then statements. In your case, it would equate to:

if (inputInt == (inputInt == 0))
{
    ...;
}
else if (inputInt == (input %2 != 0))
{
    ...;
}
... 

因此，它失败了，因为您正在询问它int是否等于boolean值.

来自msdn:
在C ++中，可以将bool类型的值转换为int类型的值；换句话说，false等于零，而true则等于非零值.在C#中，在bool类型和其他类型之间没有转换.例如，以下if语句在C#中无效:"

So, it fails because you''re asking it if an int is equal to a boolean value.

From msdn:
"In C++, a value of type bool can be converted to a value of type int; in other words, false is equivalent to zero and true is equivalent to nonzero values. In C#, there is no conversion between the bool type and other types. For example, the following if statement is invalid in C#:"

您的基本问题是您不了解switch语句. switch语句不是这种情况.要使用案例声明来做到这一点，您需要这样做:

Your basic issue is that you don''t understand switch statements. A switch statement is not a case. To do it with a case statement you''d need to do this:

switch (inputInt)                
{
                    case 0: 
                       Console.WriteLine("your input is zero.");           
             break;   
               case 2:
               case 4:
               case 6:
               case 8: // etc
Console.WriteLine("your input is even.");                        
               break;
//etc

我同意，这不是使用案例陈述的好地方，但这几乎肯定是您的老师希望看到的.要点:

1-case语句表示您列出要捕获的案例，而case并不是像您那样编写评估代码的地方
2-没有理由在这里或基本上在任何地方都使用goto.我从未在代码中使用过goto.它使您的代码不可读，也不必要.
3-您可以将一个以上的案例放在一个块中，所以我做了2,4,6,8等，然后将一个针对所有这些案例执行的代码块.

我应该添加几件事:

1-我们通常不做人的作业.我很高兴为您提供帮助，因为您正在尝试做自己的工作，而不仅仅是寻求解决方案，但在我看来，您似乎在努力处理案例陈述的工作方式，我建议您还可以与您的老师讨论此事，以确保您脑中清楚.

2-您不应该按下答案"按钮问更多问题.您应该编辑您的帖子(我已将您的回复复制到您的主要帖子中)，或使用答案"部分下的论坛.

I agree, this is not a good place to use a case statement, but this is almost certainly what your teacher wants to see. The important points:

1 - a case statement means you list the cases you want to catch, a case is NOT a place to write evaluative code, as you did
2 - there is no reason to use goto here, or, basically, almost anywhere. I have never used goto in my code. It makes your code unreadable and is unnecessary.
3 - you can put more than one case in a block, so I did 2,4,6,8, etc, then put the one block of code that executes for all those cases.

I should add a couple of things:

1 - we don''t normally do people''s homework. I was happy to help you b/c you were trying to do your own work, not just asking for a solution, but it does seem to me like you were struggling a bit with the way case statements work, and I''d recommend you also talk to your teacher about this, to make sure it''s clear in your mind.

2 - you should not push the ''answer'' button to ask more questions. You should edit your post ( I copied your replies into your main post ), or use the forum under the answers section.

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