How to Program in
C,continued...
"Hello, hackers!" Program Explained
So how did this program work? Let's look it over line by line.
The first line is "#include<stdio.h>". This simply
tells the computer how to accept input and make output ("stdio"
is short for "standard input and output.") If you were
to leave this line out, the computer wouldn't know how to output
the message "Hello, hackers!."
The second line is "void main()". It tells the computer
this is the main function under which all other C functions will
run. "Main" might use many other functions (programs)
while it is running, in this case the stdio program. The "void"
tells the program that it doesn't have to pass a value to any
other program when it is done running. You don't have to write
"void" in front of "main()," but it's good
programming practice.
The third line is just one character: "{". This
tells your computer to expect the beginning of the main function.
The fourth line is "printf( "Hello, hackers!\n"
);". The "printf" command tells the computer to
use the stdio program to figure out how to print something to
your monitor screen. "( "Hello, hackers!\n")"
tells it what to print: the words "Hello, hackers!"
followed by \n, which means "enter" (or "new line").
You have to have a new line command so your program will give
a prompt back to you after it has run.
The ";" tells the C compiler that this is the end
of this command, that whatever it sees next is the start of a
new command.
The last character is "}" which simply means it
is the end of the main function.
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