What roles do #include <stdio.h>, main, and return 0 play in a simple C program?
#include <stdio.h>
main
return 0
They provide standard I/O declarations, define the entry function, and report successful completion.
They compile the file, launch the executable, and print every variable.
They create a string, allocate all memory, and start an infinite loop.
All three are comments ignored by the compiler.