ocr: - preprocessor is buit into the C compiler. When the command to compile a program is given, the code is first preprocessed, and then compiled. Lines that begin with a # communicate with the preprocessor. This "#include" line causes the preprocessor to include a copy of header file "stdio.h" at this point in the code. This header file is provided by the C system. We have included this file because it contains information about the "printf()" function.
