C program to find maximum element in a matrix

int main()
{
  int m, n, c, d, matrix[100][100], maximum;

  printf("Enter the number of rows and columns of matrix\n");
  scanf("%d%d",&m,&n);

  printf("Enter the elements of the matrix\n");

  for (c = 0; c < m; c++)
    for(d = 0; d < n; d++)
      scanf("%d", &matrix[c][d]);

  maximum = matrix[0][0];

  for (c = 0; c < m; c++)
    for (d = 0; d < n; d++)
      if (matrix[c][d] > maximum)
        maximum = matrix[c][d];

  printf("Maximum element in the matrix is %d\n", maximum);

  return 0;
}