where should I put my image ?

edit

Here is the code to show the image :

#include "highgui.h"
#include <iostream>
#include <cv.h>

using namespace std;

int main(int argc,char** argv)
{
    char filename[]="0.jpg";
    IplImage* img = cvLoadImage(filename,CV_LOAD_IMAGE_UNCHANGED);
    if(!img){
      cout<<"Error: Couldn't open the image file.\n";
    }
    cvNamedWindow("Example1",CV_WINDOW_AUTOSIZE);
    cvShowImage("Example1",img);
    cvvWaitKey(0);
    cvReleaseImage(&img);
    cvDestroyWindow("Example1");
}


>>> char filename[]="0.jpg";

How can it load an image without telling it the direct path of the image? or should I put my image in a default path?