gcc print_integer.c test_print_integer.c -o test_print_integer


Stage 1: preprocessor
  Expand #define, #include, etc.
  Remove comments
  Run using "cpp" or for our class, "264cpp"
Stage 2: compiler
  Converts from ascii C code to binary code
  Compile from .c file into a .o file
  Run just the compiler using "gcc -c <source file>"
Stage 3: linker
  Converts all the .o files into a executable
  Matching up any function calls to an existing function
  Run just the linker using "gcc" with .o files

Run all stages together using "gcc" with .c files


Preprocess directives
  #include
  #define
  #ifdef,  #ifndef,  #endif
  #pragma