/* Program to print tables of metric equivalents */

#include <stdio.h>


/* Convert gallons and pints to liters
 *
 * Preconditions:
 *  gallons >= 0
 *  pints >= 0
 * Postconditions:
 *  Returns the equivalent volume in liters
 */
double toLiters(double gallons, double pints)
{
  return (gallons*4.0 + pints/2.0) / 1.056710;
}

/* Convert feet and inches to centimeters
 *
 * Preconditions:
 *  feet >= 0
 *  inches >= 0
 * Postconditions:
 *  Returns the equivalent length in centimeters
 */
double toCentimeters(double feet, double inches)
{
  /* according to the National Bureau of Standards, 
     effective July 1, 1959, an inch was defined as exactly 2.54 centimeters */
  return (12.0*feet + inches) * 2.54;
}


/* Print a table of metric equivalents
 *
 * Preconditions:
 *   func accepts two non-negative doubles
 * Postconditions:
 *   Prints two-dimensional table of f(x,y) over the domain [0,10]x[0,10]
 */
void printTable (double func (double, double))
{
  double row, col;
  double rowStart = 0.0;
  double rowEnd  = 10.0;
  double colStart = 0.0;
  double colEnd  = 10.0;

  /* print column titles */
  printf ("         ");  /* space at start of row */
  for (col = colStart; col <= colEnd; col++)
    {
      printf (" %5.1lf", col);
    }
  printf ("\n\n");

  /* iterate over series of rows */
  for (row = rowStart; row <= rowEnd; row++)
    {
      /* print row label */
      printf ("  %4.1lf   ", row);

      /* print table entries */
      for (col = colStart; col <= colEnd; col++)
        {
          printf (" %5.1lf", func (row, col));
        }

      /* end of row */
      printf ("\n");
    }
}

/* Print tables of English to metric equivalents for volume and distance */
int main ()
{
  printf ("Table of gallon/pint to liter equivalents\n");
  printTable (toLiters);

  printf ("\n\nTable of feet/inch to centimenter equivalents\n");
  printTable (toCentimeters); 

 return 0;
}