Operator <= cannot be applied to double in if statement

Question

I have an if statement as follows

if (1 <= value <= 20)
{

}

value is a double.

however I get an error which says that "Operator '<=' cannot be applied to operands of type 'bool' and 'double'"

Is there a way around this error?

Answer 1

C# doesn't allow you to do this.

Do like this:

if (1 <= value && value <= 20)

The problem is not the double, problem is your syntax is incorrect.

Answer 2

You:

if (1 <= value <= 20)
{

}

That is interpreted as

(1 <= value) <= 20

so first 1 will be compared with value and it will be determined if the former is "less than or equal" the latter. That gives a boolean. Then that boolean, True or False, is compared with <= to 20. But you cannot ask if True/False is less than or equal 20, in C#.

Answer 3

Problem : you can not check two expressions without Combining them.

Solution : i think you want to check whether value is in beteween 1 and 20

You can Use Logical AND && operator for checking this

Try This:

if (value >= 1 && value <= 20)
{

}

Answer 4

1 <= value evaluates out to be bool (false if value is less than 1 and true otherwise).

So it evaluates out to be (true <= 20) or (false <=20) and error states clearly that you cannot use operator <= to compare bool and double.

You need and (&&) operator to do comparison:

if (1 <= value && value <= 20)
{
}