I just started coding in C. I downloaded the C/C++ extension, ran VScode through command prompt… Everything was, so far, working perfeclty. But, I tried working with source and header file, and I got an error that I can’t get rid of.

Here are my three files:

main.c

#include <stdio.h>
#include <stdlib.h>
#include "area.h"

int main(int argc, char *argv[]) // Équivalent de int main()
{
    double result;
    result = areaRectangle(2.0,3.0);
    printf("%f", result);
    return 0;
    
}

area.h

#ifndef area_h
#define area_h
#include <stdio.h>

double areaRectangle(double , double);
#endif

area.c

#include "area.h"

double areaRectangle(double height, double lenght){
    return height*lenght;
}

And then, here is the error code that I get when running main.c (I can’t copy paste the code since it’s in french, but i’ll do my best translating it):

main.obj : error LNK2019: unresolved external symbol _areaRectangle called in function _main

I don’t know where does the problem comes from… and I checked multiple times where does the error occurs…

Thanks for your help 🙂