Obtaining Pixelvalue with various formats

edit

I tried to get the value underneath an cv::Mat dImg in the format 16UC1 but only get rubbish when obtaining one pixel value. I expect an int ranging inbetween 0 and 2^16-1 (65535) but this is what i get:

135530515
583506521733990419
4.45466e-34
1.18455e-269

with

       cout<<dImg.at<int>(240,320)<<endl;
       cout<<dImg.at<long>(240,320)<<endl;
       cout<<dImg.at<float>(240,320)<<endl;
       cout<<dImg.at<double>(240,320)<<endl;

EDIT: The image resolution is 640x480. I choose the position randomly, for others i get the same. (c++). EDIT2: Using ansers solution i get:

    125
    11
    157
    8
    0
    0

This looks fine yay :)