Exercise 1-13 (continued)

Exercise 1-13  Write a program to print a histogram of the lengths of words in its input.  (Vertical orientation).

#include <stdio.h>

  /* Don't make MAXLENGTH more than (the width of your terminal - 1)

     and don't make it more than 99 */

#define MAXLENGTH 20

int main(void)

{

  int c;

  unsigned int i;

  unsigned int length = 0;

  /* count[0] stores the number of words longer than MAXLENGTH. */

  unsigned int count[MAXLENGTH+1];

  for (i = 0; i <= MAXLENGTH; ++i)

    count[i] = 0;

  do

  {

    switch(c=getchar())

    {

    case ' ':

    case '\t':

    case '\n':

      if (length > 0)

      {

        if (length <= MAXLENGTH)

          count[length]++;

        else

          count[0]++;

        length = 0;

      }

      break;

    default:

      length++;

      break;

    }

  }

  while (c != EOF);

    /* The histogram will be as tall as the maximum length. */

  length = 0;

  for (i = 0; i < MAXLENGTH+1; ++i)

  {

    if (count[i] > length)

      length = count[i];

  }

  for ( ; length > 0 ; --length)

  {

    for (i=1 ; i < MAXLENGTH+1 ; ++i)

    {

      if (count[i] >= length)

        putchar('*');

      else

        putchar(' ');

    }

    if (count[0] >=length)

      putchar('*');

    putchar('\n');

  }

  for (i = 0; i <= ((MAXLENGTH >=10) ? MAXLENGTH+1 : MAXLENGTH) ; ++i)

    putchar('-');

  putchar('\n');

  for (i = 1; i <= MAXLENGTH; ++i)

  {

    if (i/10 > 0)

      printf("%d", i/10);

    else

      printf("%d", i);

  }

  if (MAXLENGTH/10 > 0)

    printf("%d", MAXLENGTH/10);

  else

    printf("%d", MAXLENGTH);

  putchar('\n');

  for (i = 1; i <= MAXLENGTH; ++i)

  {

    if (i/10 > 0)

      printf("%d", i%10);

    else

      putchar(' ');

  }

  if (MAXLENGTH/10 > 0)

    printf("%d", MAXLENGTH%10);

  printf("+\n");

  return 0;

}