Thread: including header files and implementation

Hello,

Just experimenting with including user header file and implementation. And compiling using gcc.

Just a simple program to demostrate. The three files are all seperate files and are in the same directory.

Code:

//currency.h 
int exchange_rate(int amount);

Code:

//currency.c implementation 
#include "currency.h"

int exchange_rate(int amount)
{
	return amount * 71;
}

Code:

#include <stdio.h>

#include "currency.h"

int main(int argc, char *argv[])
{
	printf("Welcome to currency exchange\n");
	printf("Exchange rate is: %d\n", exchange_rate(10));

	return 0;
}

[root@localhost currency]# gcc currency_app.c -o app
/tmp/cciXMhc2.o: In function `main':
currency_app.c.text+0x25): undefined reference to `exchange_rate'
collect2: ld returned 1 exit status

I thought as all the files are in the same directory. It should be able to find them.

I have also compiled currency.c using:
gcc -c currency.c
to create the object file.

Many thanks for any suggestions,

Steve

[/code]

If I am being a doofus here, just tell me if I am on the wrong track. But shouldn't it be something like this?

gcc currency_app.c currency.c -o app

Thanks,