Compiling

Compiling a source file

A special feature of Embarcadero Dev-C++ is the ability to compile (and run) single source files. This is done via the following steps:

Create (Ctrl+N) or open (Ctrl+O) a source file.
Click Compile (F9) to compile the currently visible file.
Optionally, run the created executable (F10). This compilation will use the compiler set selected at Tools >> Compiler Options.

Compiling a project largely requires the same steps:

Create (Ctrl+N) or open (Ctrl+O) a project.
Click Compile (F9) to apply changes made in a source file.
Click Rebuild (F12) to apply changes made in a header file or to recompile all files.
Optionally, run the created executable (F10). This compilation will use the compiler set selected at Tools >> Compiler Options, but unlike source file compilations, it will use the compiler settings located at Project >> Project Options >> Compiler.

For single file compilations, make sure to use proper file extensions. When not explicitly telling the compiler which standard to use (using the -std flag), use *.c to compile as C or *.cpp to compile as C++.
To reduce compilation output size, especially when using C++ headers, consider passing -s to the compiler. This can be done manually or via (Settings) >> Linker >> Strip executable. This option will remove any unused data from the output. A downside of this option is that debugging and profiling will not work anymore. An alternative but much less effective approach is to reduce the amount of included files.
To reduce compilation time, consider including less files. For example, when using a project, don't blindly include every file in every file!
To save one click in the compilation process, try out Compile & Run (F11). This will, obviously, compile and run your file or project immediately afterwards.
When changing a header file, make sure to recompile all source files that make use of it by rebuilding. Not doing so will lead to undefined executable behaviour: the code you're seeing will not be what will be executed because some source files are making use of outdated headers.