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A perfectly portable program is one whose source code can, without modification, be compiled to a successful program on a variety of different computer systems.
A source code file contains code as written in whatever language the programmer is using. An object code file contains machine language code; it need not be the code for a complete program. An executable file contains the complete code, in machine language, constituting an executable program.
Defining program objectives.
Designing the program.
Coding the program.
Compiling the program.
Running the program.
Testing and debugging the program.
Maintaining and modifying the program.
A compiler converts source code, such as code in the C language, to machine language code.
A linker combines object code from several sources, such as compiled source code and compiled library code, into a single, executable program.
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