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Use MSG BOX Function.

Using Mag Box we can check the value with in function.

This action is used to Display a message box to the user. It comes back to the original screen on
the pressing of a key. This can be used by the programmers to display intermediate values of
variables during calculations, thus helping in error diagnosis.
Syntax

 MSG BOX: :<message Expression>:<greyback Flag></font></p> <p> <br></p> <p> <font face="Courier New, Courier, monospace">Where,</font></p> <p> <font face="Courier New, Courier, monospace"><title Expression> is the value that is displayed on the title bar of the message window.</font></p> <p> <font face="Courier New, Courier, monospace"><message Expression> is the actual message which is displayed in the box. This can be an</font></p> <p> <font face="Courier New, Courier, monospace">expression as well, i.e., the variable values can be concatenated and displayed along with the</font></p> <p> <font face="Courier New, Courier, monospace">message in the display area of the box.</font></p> <p> <font face="Courier New, Courier, monospace"><Gre</font></p> <p> <font face="Courier New, Courier, monospace">yBack Flag> indicates if the background window is to be greyed out during message</font></p> <p> <font face="Courier New, Courier, monospace">display. It takes two values, i.e., YES/NO</font></p> <p> <font face="Courier New, Courier, monospace">Example:</font></p> <p> <font face="Courier New, Courier, monospace">01: MSGBOX:”Return Value”:##Factorial</font></p> </div>

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