C99 getchar() Function Implementation: A Detailed Guide

The 'getchar()' function is part of the standard C library and is implemented in C99 according to the ISO/IEC 9899:1999 standard.

The implementation of 'getchar()' typically involves reading a single character from the standard input stream, 'stdin', and returning it as an 'int' value. If 'stdin' is at the end of file, the function returns the special value 'EOF'.

The exact implementation of 'getchar()' may vary depending on the specific compiler and operating system being used, but it generally involves low-level system calls and buffer management to efficiently read characters from the input stream.