Very Simple Fix Header File and Make Compile!

Really easy project. I already have completed code. I am just having an issue of combining 4 files to compiling. 1 Header and 3 cpp. I get errors. But the program should compile perfectly if its all in one file. All i need done is to fix header safeguards ect make it compile using codeblocks and mingw. Must be done within one hour. And must compile on my end. Should be Very Simple!