I want to make program with a GUI

[rajhansk]

I want to make a program of calculating bending allowance for sheet metal.

I have made it in code blocks, but I don't know how to put it in GUI

can anybody tell me how to do this?

[CGunn86]

You could look into using a graphics API or library. You might look into WIN32 API, GTK, or QT. Those are a few of the more popular ones.