Kernighan & Ritchie word count example program in a functional language
- by Frank
I have been reading a little bit about functional programming on the web lately and I think I got a basic idea about the concepts behind it.
I'm curious how everyday programming problems which involve some kind of state are solved in a pure functional programing language.
For example: how would the word count program from the book 'The C programming Language' be implemented in a pure functional language?
Any contributions are welcome as long as the solution is in a pure functional style.
Here's the word count C code from the book:
#include <stdio.h>
#define IN 1 /* inside a word */
#define OUT 0 /* outside a word */
/* count lines, words, and characters in input */
main()
{
int c, nl, nw, nc, state;
state = OUT;
nl = nw = nc = 0;
while ((c = getchar()) != EOF) {
++nc;
if (c == '\n')
++nl;
if (c == ' ' || c == '\n' || c = '\t')
state = OUT;
else if (state == OUT) {
state = IN;
++nw;
}
}
printf("%d %d %d\n", nl, nw, nc);
}
