Buttons to interactively restart/finish a program

• To: mathgroup at smc.vnet.net
• Subject: [mg99120] Buttons to interactively restart/finish a program
• From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
• Date: Mon, 27 Apr 2009 05:25:45 -0400 (EDT)

```Dear community,
I am writing a simple interactive teaching program to teach my child
arithmetics.  Here is a simplified example on addition from 1 to 4:

Panel[DynamicModule[{a, b},
Clear[a, b, f];
a = RandomInteger[{1, 4}];
b = RandomInteger[{1, 4 - a}];
f = "?";
g1 := (Clear[f]; f = a + b);
g2 := (Clear[f]; f = "?");

Column[{
Row[{

Dynamic@Button[Style[1, 30], If[a + b == 1, g1, g2]],
Dynamic@Button[Style[2, 30], If[a + b == 2, g1, g2]],
Dynamic@Button[Style[3, 30], If[a + b == 3, g1, g2]],
Dynamic@Button[Style[4, 30], If[a + b == 4,
g1, g2]]

}],

Panel[Row[{Text[Style[a, 50]],
Text[Style["+", 50]],
Text[Style[b, 50]],
Text[Style["=", 50]],
Text[Style[Dynamic[f], 50]]}]]

}]

]
]

In this program however, one needs to manually re-execute the program
(e.g. via Shift+Enter) each time one wants to have a new execise. In
order to avoid the manual restarting in addition to the above code I
would like to include two buttons. First should restart the program, so
that the task is renewed. The second button should close the panel when
the game is finished. Thus, the program may be executed only once before
the game starts. My idea to add a restart button the way shown below did
not work:

Label["aa"];
Panel[DynamicModule[{a, b},
Clear[a, b, f];
a = RandomInteger[{1, 4}];
b = RandomInteger[{1, 4 - a}];
f = "?";
g1 := (Clear[f]; f = a + b);
g2 := (Clear[f]; f = "?");

Column[{
Row[{

Dynamic@Button[Style[1, 30], If[a + b == 1, g1, g2]],
Dynamic@Button[Style[2, 30], If[a + b == 2, g1, g2]],
Dynamic@Button[Style[3, 30], If[a + b == 3, g1, g2]],
Dynamic@Button[Style[4, 30], If[a + b == 4,
g1, g2]]

}],

Panel[Row[{Text[Style[a, 50]],
Text[Style["+", 50]],
Text[Style[b, 50]],
Text[Style["=", 50]],
Text[Style[Dynamic[f], 50]]}]],
Button["Restart", Goto["aa"]]

}]

]
]

Could anybody give me an idea?

Best, Alexei

--
Alexei Boulbitch, Dr., habil.
Senior Scientist

IEE S.A.
ZAE Weiergewan
11, rue Edmond Reuter
L-5326 Contern
Luxembourg

Phone: +352 2454 2566
Fax:   +352 2454 3566

Website: www.iee.lu

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```

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