问题
I am getting an error using while loop in this manner, and I don't understand why:
int count = 5;
while(count--) //here showing an error
{
Console.WriteLine("Number : {0}", count);
}
However, in C, the code works properly. I am little bit confused about why I am getting this error. Can anyone explain why?
回答1:
C# does not define an implicit conversion from int to bool. The while loop condition must be a bool.
You should use while(count-- != 0) instead.
In C# you have a bool type which accepts True or False as value. In C everything other than 0 is true and 0 indicates null. So you can have if (1) in C but 1 is not a logical expression in C#.
回答2:
C# does not allow implicit casts from int to bool(ean). You should explicitly do that:
int count = 5;
while(count-- != 0)
{
Console.WriteLine("Number : {0}", count);
}
回答3:
While loop is using bool values to determine if continue loop or exit loop
In Your example count value is int and this cause error/
Simple refactorig is this:
int count = 5;
while (count != 0 )
{
count--;
Console.WriteLine("Number : {0}", count);
}
Now when count value will by 0 it will break loop
回答4:
This will fix it!
while (count-- >= 0)//here showing an error
{
Console.WriteLine("Number : {0}", count);
}
来源：https://stackoverflow.com/questions/35816069/why-cant-i-use-an-integer-as-a-condition-for-a-while-loop-in-c