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

void printTransfer ( int i, int qty, char src, char dst,
                    double pcnt1, double pcnt2 )
{
   printf("Transfer %3d: %d ml from %c to %c, ", i, qty, src, dst);
   printf("Alcohol percentages: ");
   printf("%7.3lf and %7.3lf\n", pcnt1, pcnt2);
}

/*** For students with ODD PC numbers ***/
int oddmain ()
{
   double x, /* quantity of alcohol in Glass 1 */
          y, /* quantity of alcohol in Glass 2 */
          u, /* quantity of water in Glass 1 */
          v; /* quantity of water in Glass 2 */
   int i;

   /* Initialize */
   x = 0; u = 100; /* Glass 1 contains only water */
   y = 100; v = 0; /* Glass 2 contains only alcohol */

   /* First move 10 ml from Glass 2 to Glass 1 */
   i = 1; x += y / 10; u += v / 10; y -= y / 10; v -= v / 10;
   printTransfer(i, 10, 'B', 'A', 100 * x / (x + u), 100 * y / (y + v));

   /* Iterate */
   while ((y/(y+v)-x/(x+u)) > 0.01) {
      ++i;
      if (i % 2 == 0) { /* Move 20 ml from Glass 1 to Glass 2 */
         y += 2 * x / 11; v += 2 * u / 11; x -= 2 * x / 11; u -= 2 * u / 11;
         printTransfer(i, 20, 'A', 'B', 100 * x / (x + u), 100 * y / (y + v));
      } else {          /* Move 20 ml from Glass 2 to Glass 1 */
         x += 2 * y / 11; u += 2 * v / 11; y -= 2 * y / 11; v -= 2 * v / 11;
         printTransfer(i, 20, 'B', 'A', 100 * x / (x + u), 100 * y / (y + v));
      }
   }

   /* Final adjustment */
   ++i;
   if (i % 2 == 0) { /* Move 10 ml from Glass 1 to Glass 2 */
      y += x / 11; v += u / 11; x -= x / 11; u -= u / 11;
      printTransfer(i, 10, 'A', 'B', 100 * x / (x + u), 100 * y / (y + v));
   } else {          /* Move 10 ml from Glass 2 to Glass 1 */
      x += y / 11; u += v / 11; y -= y / 11; v -= v / 11;
      printTransfer(i, 10, 'B', 'A', 100 * x / (x + u), 100 * y / (y + v));
   }

   exit(0);
}

/*** For students with EVEN PC numbers ***/
int evenmain ()
{
   double x, /* quantity of alcohol in Glass 1 */
          y, /* quantity of alcohol in Glass 2 */
          u, /* quantity of water in Glass 1 */
          v; /* quantity of water in Glass 2 */
   int i;

   /* Initialize */
   x = 100; u = 0; /* Glass 1 contains only alcohol */
   y = 0; v = 150; /* Glass 2 contains only water */
   i = 0;

   while ((x/(x+u) - y/(y+v)) > 0.01) {
      /* Move 10 ml from Glass 1 to Glass 2 */
      ++i;
      y += x / 10; v += u / 10; x -= x / 10; u -= u / 10;
      printTransfer(i, 10, 'A', 'B', 100 * x / (x + u), 100 * y / (y + v));

      /* Move 10 ml from Glass 2 to Glass 1 */
      ++i;
      x += y / 16; u += v / 16; y -= y / 16; v -= v / 16;
      printTransfer(i, 10, 'B', 'A', 100 * x / (x + u), 100 * y / (y + v));
   }

   exit(0);
}

int main ()
{
   char parity;

   while (1) {
      printf("Odd or Even? "); scanf("%c", &parity);
      if ((parity == 'o') || (parity == 'O')) oddmain();
      if ((parity == 'e') || (parity == 'E')) evenmain();
  }
  exit(1);
}