multiple C source files howto

introuble · 07-31-2005, 07:52 AM

Ok ..

So how would you do this under linux:

You have a program and you want cirtain "functions" to be in sepparate source files .. how would you compile this program ?

i.e:

main.c : contains "main" function which calls function 'test", includes "prog.h"

prog.h : definition for function "test"

test.c : body of function test

?

sind · 07-31-2005, 08:50 AM

It can be as simple as:

Code:

$ gcc -o program main.c test.c

Or, you can have seperate commands for each step:

Code:

$ gcc -c main.c
$ gcc -c test.c
$ gcc -o program main.o test.o

~sind

jonaskoelker · 07-31-2005, 07:49 PM

Quote:

prog.h: definition of "test"
test.c: body of "test"

The definition of a function *is* it's body.

I think you mean that the *declaration* is in prog.h

Code:

/* declaration */
int factorial(int);

/* definition */
int factorial(int n) {
  if (!n) return 1;
  return n * factoral(n - 1);
}

hth --Jonas