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#include <stdio.h>
The first line of the program that a preprocessor command, which tells a C compiler to include stdio.h file before going to actual compilation.
int main()
The next line after #include <stdio.h> is the main function where program execution begins.
/* */
will be ignored by the compiler and it has been put to add additional comments in the program. So such lines are called comments in the program.
printf(...)
A function call usually within brackets "{ }" available in C which causes the messages such as "Hello, World!" to be displayed on the screen
