Question

int monthentered = 0;
int dayentered = 0;
int year = 0000;
int [] month = new int [12];
int [] day = new int [31];
bool leap = false;

for (int x = 0; x <= 11; x++)
{
    month[x] = x+1;
}

for (int x = 0; x <= 30; x++)
{
    day[x] = x+1;
}
Console.WriteLine("Please enter a year...");
year = (Convert.ToInt16(Console.ReadLine()));
Console.WriteLine("{0}", year);

Console.WriteLine("Please enter a month...");
monthentered = (Convert.ToInt16(Console.ReadLine()));

Console.WriteLine("Please enter a day...");
dayentered = (Convert.ToInt16(Console.ReadLine()));

while (monthentered == 01 || 03 || 05 || 07 || 08 || 10 || 12)
{
    while (dayentered == 31)
    {
        Console.WriteLine("There are only 30 days in this month please re-enter your day...");
        dayentered = (Convert.ToInt16(Console.ReadLine()));
    }
}

while (monthentered == 02)
{
    while (dayentered > 28)
    {
        Console.WriteLine("There are only 28 days in this month please re-enter your day...");
        dayentered = (Convert.ToInt16(Console.ReadLine()));
    }
}

Console.WriteLine("{0}/{1}/{2}", dayentered, monthentered, year);
Console.ReadKey();

第while (monthentered == 01 || 03 || 05 || 07 || 08 || 10 || 12)行有什么问题吗？我收到一个我不理解的错误。 "Operator '||' cannot be applied to operands of type 'bool' and 'int'"

请帮忙。

Answer 1

while(monthentered == 01 || monthentered == 03 || monthentered == 05 || monthentered == 07 || monthentered == 08 || monthentered == 10 || monthentered == 12)

||之间的每次操作和＆amp;＆amp;必须渲染到布尔值（即完整的测试），因为每个操作都是独立计算的

Answer 2

现在它就像while(bool || int || int)，我想你想要这样的东西：

while (monthentered == 1 || monthentered == 3 || monthentered == 5 /*|| ...*/)

您需要每次都检查变量的值，因此它将是while(bool || bool || bool)等

您还可以创建有效月份的集合，并检查输入的数字是否在其中。

Answer 3

运营商'||'不能应用于'bool'和'int'
类型的操作数

您无法在数字上使用|| - 您使用||的每个部分都应评估为bool。

条件应该如下：

while (monthentered == 01 || 
       monthentered == 03 || 
       monthentered == 05 || 
       monthentered == 07 || 
       monthentered == 08 || 
       monthentered == 10 || 
       monthentered == 12)

虽然更可读的选项是：

var validMonths = new int[] { 1, 3, 5, 7, 8, 10, 12 };

while(validMonths.Contains(monthentered))

Answer 4

应该是

while (monthentered  == 01 ||monthentered  == 03 || monthentered  ==05 || monthentered  ==07 || monthentered  ==08 || monthentered  ==10 || monthentered  ==12)

Answer 5

您无法将int与bool与|| operator进行比较。 monthentered == 01为bool（真/假），其余为ints。

所以将while改为：

int[] allAllowedMonths = new[]{ 1, 3, 5, 7, 8, 10, 12 };
while (allAllowedMonths.Contains( monthentered ))
{
    // ...
}

Answer 6

C＃，只接受真/假表达式！

while (monthentered == 01 || monthentered ==03 || monthentered ==05 || monthentered ==07 || monthentered ==08 || monthentered ==10 || monthentered ==12)

Answer 7

应该是

while (monthentered == 01 || 
       monthentered == 03 || 
       monthentered == 05 || 
       monthentered == 07 || 
       monthentered == 08 || 
       monthentered == 10 || 
       monthentered == 12)

 {  
   //code here
 }

Answer 8

直接回答导致代码编译但不会工作：您需要使用

(monthentered == 01 || monthentered == 03 || monthentered == 05 ||
 monthentered == 07 || monthentered == 08 || monthentered == 10 ||
 monthentered == 12)

其他问题：

您的代码在大多数月份内允许超过32天。
月份上的while循环永远不会终止，因为您永远不会更改月份的值。请改用if语句。

额外提示：您可以使用DateTime.DaysInMonth获取每月和每年允许的最大数量，而不是手动检查月份数。这也将适应闰年。

Answer 9

这是繁琐的语法，但您需要将while语句编写为：

while (monthentered == 01 || monthentered == 02 || monthentered == 3 ...等

您的语句将首先评估布尔条件monthentered == 01，然后尝试逻辑或结果与其他数字一起生成因此错误。

但是，我会看看你想要做什么，看看while循环是否真的是你想要的。

我的“while”声明出了什么问题

9 个答案: