Just press the “Compile To” button and then you can compile the output to see the program execute. The new standard does bring some complexity, but still nothing like C++. Why use C?

To optimize your code, the compiler will analyze your program and make deductions. Compilers will often attempt optimization of wide scope, so this analysis can span multiple functions, multiple files ...

The GNU Compiler Collection will be refreshed with updated C++ standards compliance and improvements in parallelism and diagnostics. Described as a “major” release, GCC 6.1 leverages the C++ ...

The C release represents an alpha-version technical preview of Valida’s software stack. By Compiling C, Lita now has a compiler backend ready, which is one of the most fundamental components.

Under Windows, I would recommend the free Borland C++ Compiler 5.5 (take a look here, but free registration is required). For *nix, I would recommend gcc.