The Netbeans website provides a comprehensive FAQ detailing how to install the C/C++ plugin as well as integrating your chosen C/C++ compiler, linker and debugger package.
To use C++ in Netbeans you will need a C++ compiler.
Netbeans is primarily a code editor and Java compiler. Although it supports the C++ language, it has no C++ compiler or linker. For that you must provide your own.
Of course.
You can find a detailed guide on CC plus on geany.org/manual/current/
The back end for C++ is often C. In the early days of C++ compilers, implementors took advantage of the fact that C++ was an extension of C, and wrote C++ compilers that generated C as an intermediate file, passing it to a C compiler. Nowadays, most C++ compilers generate native object code in their own right, although there are still a few implementations that use the C++ to C paradigm.
Yes, you can do projects in C and in C++. Most compilers will recognize the source file by its extension, and adjust itself accordingly.
They are different languages, each of them requires its own compiler.
You cannot install programming languages (or natural languages, either) on your computer. You can install compilers for programming languages, though.
You cannot 'install' programming languages. Instead, you can try to install a compiler or an IDE.
Programming is a human activity, it cannot be installed. Compilers, on the other hand, can be installed.
You cannot download a programming language, but you can download compilers. Check the attached link.
Java: At java.sun.com in the download JDKcategory.C: Google for "Free C/C++ Compilers"