dimensional

#include <stdio.h>
const int ROW = 4;
const int COLUMN = 4;

int main()
{

  int i, j, preferred_row, count=0;
  float sum = 0, avg, arr[ROW][COLUMN];
  char op;
  scanf("%d %c", &preferred_row, &op);

  for (i = 0; i < ROW; i++)
  {
    for (j = 0; j < COLUMN; j++)
    {
      scanf("%f", &arr[i][j]);
    }
  }
  for (i = preferred_row-1; i <= preferred_row-1; i++)
  {
    for (j = 0; j < COLUMN; j++)
    {
      printf("%.2f ", arr[i][j]);
      sum += arr[i][j];
      count+=1;
    }
  }
  if (op == 'S')
    printf("%.2f", sum);
  else if (op=='M')
  {
    printf("%.2f", (float)sum/count);
  }

  return 0;
}