Microsoft® Visual Basic® Scripting Edition Eval Function |
Language Reference Version 5 |
Evaluates an expression and returns the result.
[result = ]Eval(expression)The Eval function syntax has these parts:
Part Description result Optional. Variable to which return value assignment is made. If result is not specified, consider using the Execute statement instead. expression Required. String containing any legal VBScript expression.
In VBScript, x = y can be interpreted two ways. The first is as an assignment statement, where the value of y is assigned to x. The second interpretation is as an expression that tests if x and y have the same value. If they do, result is True; if they are not, result is False. The Eval method always uses the second interpretation, whereas the Execute statement always uses the first.Note In Microsoft® JScript™, no confusion exists between assignment and comparison, because the assignment operator (=) is different from the comparison operator (==).
The following example illustrates the use of the Eval function:
Sub GuessANumber Dim Guess, RndNum RndNum = Int((100) * Rnd(1) + 1) Guess = CInt(InputBox("Enter your guess:",,0)) Do If Eval("Guess = RndNum") Then MsgBox "Congratulations! You guessed it!" Exit Sub Else Guess = CInt(InputBox("Sorry! Try again.",,0)) End If Loop Until Guess = 0 End Sub