Hi everyone can anyone tell me how the graphical softwares are made?

Question

and which language and platform is best for making these graphical software recently i have completed a project on banking system that is in cpp language and it is just a console application with no gui.

Answer 1

have a look for Qt or gtk ;)

Answer 2

but some people have asked me to go for asp.net with c# for cross platform application developmemt

Answer 3

Well you can go with what ever you want, but
1) your flag said c++, so I answered to this
2) I wouldn't think of c# when I think about cross platform, but I know that they working on it, but have no idea of the current status...
3) then you can also think about "go" or java ;) look what has the most advantage for your specific problem (c# : threading, go : scaling)
4) think about the effort you have to put in the interface of different languages...