[英]Whats wrong with my “while” statement
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();
while (monthentered == 01 || 03 || 05 || 07 || 08 || 10 || 12)
时行有什么问题吗? 我收到一个我不明白的错误。 "Operator '||' cannot be applied to operands of type 'bool' and 'int'"
请帮忙。
while(monthentered == 01 || monthentered == 03 || monthentered == 05 || monthentered == 07 || monthentered == 08 || monthentered == 10 || monthentered == 12)
||之间的每个操作 和&&必须渲染为布尔值(即完整测试),因为每个操作都是独立计算的
现在就像while(bool || int || int)
,我想您想要这样的东西:
while (monthentered == 1 || monthentered == 3 || monthentered == 5 /*|| ...*/)
您需要每次检查变量的值,因此它会是while(bool || bool || bool)
等
您还可以创建有效月份的集合,并检查其中输入的数字。
运算符'||' 不能应用于'bool'和'int'类型的操作数
您不能使用||
在数字上-您正在使用的每个部分||
与应该评估为bool
。
条件应如下所示:
while (monthentered == 01 ||
monthentered == 03 ||
monthentered == 05 ||
monthentered == 07 ||
monthentered == 08 ||
monthentered == 10 ||
monthentered == 12)
尽管更易读的选项是:
var validMonths = new int[] { 1, 3, 5, 7, 8, 10, 12 };
while(validMonths.Contains(monthentered))
它应该是
while (monthentered == 01 ||monthentered == 03 || monthentered ==05 || monthentered ==07 || monthentered ==08 || monthentered ==10 || monthentered ==12)
C#同时仅接受true / false表达式!
while (monthentered == 01 || monthentered ==03 || monthentered ==05 || monthentered ==07 || monthentered ==08 || monthentered ==10 || monthentered ==12)
它应该是
while (monthentered == 01 ||
monthentered == 03 ||
monthentered == 05 ||
monthentered == 07 ||
monthentered == 08 ||
monthentered == 10 ||
monthentered == 12)
{
//code here
}
直接答案会导致代码可编译但不起作用 :您需要使用
(monthentered == 01 || monthentered == 03 || monthentered == 05 ||
monthentered == 07 || monthentered == 08 || monthentered == 10 ||
monthentered == 12)
进一步的问题:
while
循环永远不会终止,因为您永远不会更改月份的值。 改用if
语句。 额外提示:您可以使用DateTime.DaysInMonth
来获取每个月和每年允许的最大数字,而不是手动检查月份数。 这也将适应leap年。
这是乏味的语法,但您需要将while语句编写为:
while (monthentered == 01 || monthentered == 02 || monthentered == 3
... etc
您的语句将首先对布尔条件monthentered == 01
进行求值,然后尝试对其他整数进行逻辑运算或得出结果,从而得出错误。
但是,我将看一下您要尝试执行的操作,看看在这里是否真的需要while循环。
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