Exercise 1-13

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

#include <stdio.h>

#define MAXLENGTH 20

void print_histo(unsigned int n)

{

  int j;

  for (j = 0; j < n; ++j)

    putchar('*');

  putchar('\n');

}

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);

  for (i = 1; i < MAXLENGTH+1; ++i)

  {

    printf("%3d  | ", i);

    print_histo(count[i]);

  }

  printf("%3d+ | ", MAXLENGTH);

    print_histo(count[0]);

  return 0;

}