1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | // HEADER file
#ifndef __PRINT_INTEGER_H__
// "If there is no symbol called __PRINT_INTEGER_H__
// defined, yet, then allow this code."
//
// #ifndef means "if not defined"
#define __PRINT_INTEGER_H__
// "Define the symbol __PRINT_INTEGER_H__."
// This is not going to be used for replacement.
//////////////////////////////////
// (declarations go here)
//////////////////////////////////
#endif /* end of include guard: __PRINT_INTEGER_H__ */
// "This is the end of the matching #ifndef or #ifdef block
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