Re: counting words in input

"Daniel T." <>
Thu, 20 Dec 2007 14:39:34 -0500
Jerry Coffin <> wrote: says...

[ ... ]

 * Write a program to count word size of greater than or equal to 4
     including printing the list of unique words in the input. Test your
     program by running it on program's source file.

People have already talked quite a bit about the part you really asked
about, but I thought I'd add a slightly different approach to the task

#include <iostream>
#include <set>
#include <algorithm>
#include <string>

class shorter_than {
    size_t x;
    shorter_than(size_t c) : x(c) {}

    bool operator()(std::string const &s) {
        return s.length() < x;

int main() {
    std::set<std::string> words;

        std::inserter(words, words.begin()),

    std::cout << words.size() << " unique words:\n";
    std::copy(words.begin(), words.end(),
        std::ostream_iterator<std::string>(std::cout, "\n"));
    return 0;

std::remove_copy_if copies one container to another, leaving out any
that meet the specified criteria. std::set only allows one copy of a
specific item to be inserted, so each one is automatically unique,
without explicitly removing duplicates.

I thought of the above myself, but I'm not sure if it satisfies the
problem statement...

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