Creating header files and includes

**asilvester635** · 01-27-2017

I'm attempting to create a function called Greetings, where I put it in a separate file. I followed a tutorial on youtube, but it kept giving me errors. Below is the source code for the main.cc, Greetings.cc, and Greetings.h. Though when I tried compiling it through my Mac's terminal it ran quite fine, but when I tried running it inside my text editor (Sublime Text 3), it keeps on giving me these weird errors, long ones. Does anyone see anything wrong?

main.cc

Code:

#include <cstdio>
#include "Greetings.h"
using namespace std; 

int main() {
    Greetings bo;
    return 0;
}

Greetings.cc

Code:

#include <cstdio>
#include "Greetings.h"

Greetings::Greetings() {
    printf("Hello, how are you?\n");
}

Greetings.h

Code:

#ifndef GREETINGS_H 
#define GREETINGS_H 

class Greetings {
public:
    Greetings();
};


#endif

**jimblumberg** · 01-27-2017

Why are you using C-stdio functions instead of the safer C++ streams?

What exactly are your errors?

Did you add "Greetings.cc" to your project?

Jim

**asilvester635** · 01-27-2017

Okay, I changed it to #include <iostream>, but it still gave me errors.

When I tried running the main.cc within sublime text 3, it gave me this error
Undefined symbols for architecture x86_64:
"Greetings::Greetings()", referenced from:
_main in main-d6c18e.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
[Finished in 0.7s with exit code 1]
[shell_cmd: g++ "/Users/conrados/Desktop/C++ Programs/Greetings/main.cc" -o "/Users/conrados/Desktop/C++ Programs/Greetings/main" && "/Users/conrados/Desktop/C++ Programs/Greetings/main"]
[dir: /Users/conrados/Desktop/C++ Programs/Greetings]
[path: /usr/bin:/bin:/usr/sbin:/sbin]

**Salem** · 01-28-2017

> [shell_cmd: g++ "/Users/conrados/Desktop/C++ Programs/Greetings/main.cc" -o "/Users/conrados/Desktop/C++ Programs/Greetings/main" && "/Users/conrados/Desktop/C++ Programs/Greetings/main"]
Your build command is wrong.
This tries to compile and link a complete program in one step.

When you have multiple source files, you typically need to do
g++ -c main.cc
g++ -c Greetings.cc
and so on for every source file in your project.

Then at the end, you do
g++ -o program main.o Greetings.o
adding the whole list of .o files you compiled individually.

The way you organise all this for larger projects is by using 'make' files.

With just two files, you could brute-force it with
g++ "/Users/conrados/Desktop/C++ Programs/Greetings/main.cc" "/Users/conrados/Desktop/C++ Programs/Greetings/Greetings.cc" -o "/Users/conrados/Desktop/C++ Programs/Greetings/main"

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