The IDE is an Integrated Development Environment, meaning that it puts several tools together into one program: the editor, the compiler(s), the debugger, the forms designer, etc.
Most C/C++ IDEs I know of allow you to compile with whatever language and standard you want: C90, C11, C++98, and C++11. It should be somewhere in your preferences to set the compiler switches.
I use Qt Creator (an IDE) which is available for windows, linux & mac and is free. Qt 5.0 is due out soon. It uses the gcc compiler that can do C11 if you set the right compiler options.
There are plenty of compilers that can do C11
I also use KDevelop which runs on a linux OS. If you are into computing big time, consider getting linux. It is completely free and there are 10,000 odd free apps to download if you wish. Linux is great for programmers because there are all kinds of coding you can learn - you name it - you can probably do with linux.