Probably a multitude of things, just what fits the job. For instance, they can use C++ for their core applications, and Java for the layers around the core.
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Any programming language can be used. Some are more suitable than others.
Yes.
No. .NET is a framework, not a programming language. It is the common framework used by the C#, F# and Visual Basic programming languages.
programming languages B and BCPL which was used to derive C
Plankalkul is the programming language that was designed by Konrad Zuse. It was the first real computer programming language used for engineering.