is there a way to read an image directly from a directory (not passing arguments)?

edit

HI all I have been trying ro read an image: see theses 2 lines. But I just don get it. If I use arguments then I can, but, what I need is to get it directly from the folder. Please your adivise Thanks.

#include <opencv2/core.hpp>
using namespace cv;

#include <iostream>
using namespace std;

int main()
{
    //Mat left = imread("C:\\Users\\Fcastro\\source\\repos\\pose\\cbimages\\0_degrees.pgm");
    Mat left = imread("C:/Users/Fcastro/source/repos/pose/cbimages/0_degrees.pgm");
    imshow("Left Image View", left);
    getchar();
}