Hello World in C

Here's a hopefully familiar looking C version of "hello, world":

#include <stdio.h>
int main() {
   printf("Hello, World!\n");
   return 0;
}

Compilation

You can compile it with:

gcc -g -o hello hello_world.c

clang -g -o hello hello_world.c

Or you can build a Makefile:

CC      = gcc
CFLAGS  = -g
RM      = rm -f

default: all

all: hello

hello: hello_world.c
	$(CC) $(CFLAGS) -o hello hello_world.c

clean veryclean:
	$(RM) hello

And type make to execute it.

All of these produce a binary, hello - which prints "Hello, World!".

Takeaways

The source code is short and to the point.
You include stdio.h to pull in printf. This is a "copy paste"---the contents of stdio.h are included directly in your compilation.
You either need to create a platform specific build script (specifying your compiler), or use a tool like configure (or CMake---which we'll talk about in C++).
Compilation is really fast.
It's not specified anywhere, but you are depending upon your platform's C standard library (libc, glibc, etc.). Your program is dynamically linked with it. You need to have libc installed to run your program.

Rust from C/C++

Hello World in C

Compilation

Takeaways