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I was trying to draw a gradient image with opencv's step But the result was wrong. Could someone give me some hints ? thanks!

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main( int argc, char** argv )
{
    Mat img;
    Scalar a = 0;
    img = Mat(32, 32, CV_8UC1, a);
    unsigned char *p;
    for(int i=0; i<img.rows; i++)
    {
        p = img.data + i*img.step[0];
        for(int j=0; j<img.cols; j++, p++)
        {
                *p = j;
        }
    }
    imwrite("gradient.png", img);
    return 0;
  }