#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define NPOINTS 20

int main ()
{
   int i;
   float X[NPOINTS], Y[NPOINTS], maxX, minX, maxY, minY;

   srand((unsigned int)time(NULL));

   for (i=0; i<NPOINTS; ++i) {
      X[i] = (float)(rand() % 21 - 10);
      Y[i] = (float)(rand() % 21 - 10);
      printf("Point %2d : (%8.4f,%8.4f)\n", i, X[i], Y[i]);
   }

   maxX = maxY = -11; minX = minY = 11;
   for (i=0; i<NPOINTS; ++i) {
      if (X[i] > maxX) maxX = X[i];
      if (X[i] < minX) minX = X[i];
      if (Y[i] > maxY) maxY = Y[i];
      if (Y[i] < minY) minY = Y[i];
   }
   printf("Corners of the smallest rectangle:\n");
   printf("Lower-left  : (%8.4f,%8.4f)\n", minX, minY);
   printf("Lower-right : (%8.4f,%8.4f)\n", maxX, minY);
   printf("Upper-left  : (%8.4f,%8.4f)\n", minX, maxY);
   printf("Upper-right : (%8.4f,%8.4f)\n", maxX, maxY);
   printf("Area : %8.4f\n", (maxX-minX)*(maxY-minY));
}