make a program

i wrote the calculator program.
now i wanna have a calculator like the windows calculator.
how can i make a shape kile that??!!!!!!!
which software is need?
A GUI library
Some are: Windows API, GTK+, GTKmm, Qt, wxWidgets
is it difficult?
Not much, there are tools which allow you to design the GUI with a drag & drop interface and load the result into your program.
Even writing the entire GUI directly from code is not much difficult for small projects
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