Thread: Help understanding Histogram Word Count Program

Hello everyone, sorry I had to make a new thread, but I could not edit the last, and special thanks goes to Salem who showed me how to properly output the code on here.

Code:

#include <stdio.h>

#define MAXWORDLEN 10


int main(void)
{
  int c;
  int inspace = 0;
  long lengtharr[MAXWORDLEN + 1];
  int wordlen = 0;


  int firstletter = 1;
  long thisval = 0;
  long maxval = 0;
  int thisidx = 0;
  int done = 0;


  for(thisidx = 0; thisidx <= MAXWORDLEN; thisidx++)
  {
    lengtharr[thisidx] = 0;
  }


  while(done == 0)
  {
    c = getchar();


    if(c == ' ' || c == '\t' || c == '\n' || c == EOF)
    {
      if(inspace == 0)
      {
        firstletter = 0;
        inspace = 1;


        if(wordlen <= MAXWORDLEN)
        {
          if(wordlen > 0)
          {
            thisval = ++lengtharr[wordlen - 1];
            if(thisval > maxval)
            {
              maxval = thisval;
            }
          }
        }
        else
        {
          thisval = ++lengtharr[MAXWORDLEN];
          if(thisval > maxval)
          {
            maxval = thisval;
          }
        }
      }
      if(c == EOF)
      {
        done = 1;
      }
    }
    else
    {
      if(inspace == 1 || firstletter == 1)
      {
        wordlen = 0;
        firstletter = 0;
        inspace = 0;
      }
      ++wordlen;
    }
  }


  for(thisval = maxval; thisval > 0; thisval--)
  {
    printf("%4d  | ", thisval);
    for(thisidx = 0; thisidx <= MAXWORDLEN; thisidx++)
    {
      if(lengtharr[thisidx] >= thisval)
      {
        printf("*  ");
      }
      else
      {
        printf("   ");
      }
    }
    printf("\n");
  }
  printf("      +");
  for(thisidx = 0; thisidx <= MAXWORDLEN; thisidx++)
  {
    printf("---");
  }
  printf("\n       ");
  for(thisidx = 0; thisidx < MAXWORDLEN; thisidx++)
  {
    printf("%2d ", thisidx + 1);
  }
  printf(">%d\n", MAXWORDLEN);
  getch();


  return 0;
}

Question 1: When the lengtharr[thisidx] is being initialized, does that make thisidx equal to zero or its just a first element?

Question 2: Which part stores the word count in the array or is it being store at all?

Question 3: what does

Code:

thisval = ++lengtharr[MAXWORDLEN];

do, does it adds an element or what?

The output of the code is on The C Programming Language Exercise 1-13

Any help is greatly appreciated and thank you for your time in reading this lengthy post.

Thank you very much std10093!