Suppose the user is asked to input a number into txtNumber for which the square root is to be taken. Fill in the If block so that the lines of code that follow will display either the message “Number can’t be negative.” or the square root of the number. Private Sub btnSqrt_Click(...) Handles btnSqrt.Click 'Check reasonableness of data Dim num As Double num = CDbl(txtNumber.Text) If End If End Sub

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.