Execute() and Eval() statements in QTP

Eval()
Evaluates an expression and returns the result.

Eval always take the "=" as comparision

while the execute take the "=" as assignment

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 Execute statement always uses the first interpretation, whereas the Eval method always uses the second.

call evalexecute()

Sub evalexecute

   Dim z

   z = "4"

   print eval("z=5")   & "---  Eval Print  - should return False "

   print eval("z=4")   & "---  Eval Print  - should return True "

   print z    & "---  Eval Print  - value of z should be unchanged"

   print execute ("z=8")   & "- should be blank as execute will not return anything"

   print z     & "---  Eexcute Print - should print 8" 

End Sub