I've figured out I'm not doing the syntax wrong when I'm trying to use multiple files. I'm setting up my header files and stuff fine. It seems like code:blocks is causing problems. Does anyone know anything about this? I was trying to use a void function from a different .cpp file, that was declared in a header file. I've done all sorts of things with file properties, making sure all files are fine and everything. I always either get no errors or warnings and when I run the program it's blank, or I get errors relating to the header file.