2.4 FUNCTION CALLS FROM A LIBRARY
Functions like getchar( ), putchar( ), printf( ), and scanf( ) are defined in the stdio.h file. Functions
like strlen( ), strcpy( ), strcat( ), strcmp( ), and strrev( ) are defined in a string.h header file. A
function like exit(0) is defined in a process.h file. Similarly, functions like sin( ), cos( ), tan( ), and so
on are included in a math.h header file.
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