Getting all anagrams of the english language. The filtered_dict file was generated with: curl "http://www.freebsd.org/cgi/cvsweb.cgi/src/share/dict/web2?rev=1.12;content-type=text%2Fplain" | tr "[:upper:]" "[:lower:]" | uniq > filtered_dict

anagrams.cpp

#include <map>
#include <string>
#include <fstream>
#include <iostream>

int main(int argc, const char * argv[])
{
    std::multimap<std::string, std::string> contents;

    std::ifstream inFile("filtered_dict");
    char szWord[128];

    inFile.getline(szWord, sizeof(szWord));

    while (!inFile.eof())
    {
        std::string key(szWord);
        std::string word(szWord);

        std::sort(key.begin(), key.end());

        contents.insert(std::make_pair(key, word));

        inFile.getline(szWord, sizeof(szWord));
    }

    auto it(std::begin(contents));

    for ( ; it != std::end(contents); ++it)
    {
        auto range(contents.equal_range(it->first));

        if (std::distance(range.first, range.second) == 1)
            continue;

        std::for_each(range.first, range.second, [&](const std::pair<std::string, std::string>&p) {std::cout << p.second << " ";});
        std::cout << std::endl;
        it = range.second;
    }

    return 0;
}