Matt2012 - 1 year ago 118
C Question

# Print a Histogram based on word lengths (C)

This is a K&R exercise (1-13)...

"Write a program to print a histogram
of the length of words in its input.
It is easy to draw the histogram with
bars horizontal; a vertical
orientation is more challenging."

The section was about arrays, and to be honest, I'm not sure I fully understood it. Everything up to this point was fairly easy to grasp, this was not.

Anyway I'm trying to do a histogram with horizontal bars first. Once I got that down I'll try vertical, but right now I'm not even sure where to begin with the easy version. (I slept on it, woke up, and still couldn't get it.)

I drew an example of what the program would output:

``````----------------------------------------------------------------
001|XX
002|XXXX
003|X
004|XXXXXXXXXX
005|XXXXXXXXXXXXXXXXXXXXXXXXX
006|XXXX
007|X
008|
009|XXXXXXXXX
010|XXX
>10|XXXX
----------------------------------------------------------------
``````

And tried to break it (the program) down in sections. This is what I came up with:

1. PRINT TOP BORDER

2. PRINT CATEGORY, PRINT X EACH TIME CONDITION IS TRUE, PRINT NEWLINE,
REPEAT.

3. PRINT BOTTOM BORDER

But the more I think about it the less I think that's how it would work (because
`getchar()`
goes through one character at a time, and it wouldn't be able to go back up to put a X in the right category.) Or...

... I'm just really confused as to how I would solve this problem. Here's as far as I've been able to get code wise:

``````#include <stdio.h>

#define MAXWORDLENGTH 10

// print a histogram of the length of words in input. horizontal bar version

int main(void)
{
int c;
while ((c = getchar()) != EOF) {

}

return 0;
}
``````

Could someone help enlighten me? Not necessarily with the code, maybe just pseudo code, or with some "words from the wise" as to what I need to do, or think, or something. This has just been a really big stone in the road and I'd like to get past it :/.

(I'll check back in 30 minutes)