This is the calculator example (calc) from the book Effective Tcl/Tk Programming. It demonstrates one way applications that do not use the Rappture Toolkit can be installed in the HUB environment. This example uses Tcl/Tk to manage the graphical user interface, and bc in the background to do simple calculator functions including addition, subtraction, multiplication and division.

Harrison, Mark and McLennan, Michael. Effective Tcl/Tk programming: writing better programs with Tcl and Tk. Redwood City, CA, USA: Addison Wesley Longman Publishing Co., Inc., 1998. Print

Researchers should cite this work as follows:

• Derrick Kearney (2013), "Calculator," https://help.hubzero.org/resources/calc.

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