C header issue: #include and “undefined reference”

Question

Alright, I\'ve been trying to work with this for the longest time, and I simply can\'t seem to get it to work right. I have three files, main.c, hello_world.c

Answer 1

You should link object file compled from your second .c file hello_world.c with your main.o

try this

cc -c main.c
cc -c hello_world.c
cc *.o -o hello_world