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Word frequency: Difference between revisions
→{{header|C++}}
Line 1,638:
9 he 6814
10 had 6139</pre>
===C++20===
{{trans|C#}}
<lang cpp>#include <algorithm>
#include <iostream>
#include <format>
#include <fstream>
#include <map>
#include <ranges>
#include <regex>
#include <string>
#include <vector>
int main() {
std::ifstream in("135-0.txt");
std::string text{
std::istreambuf_iterator<char>{in}, std::istreambuf_iterator<char>{}
};
in.close();
std::regex word_rx("\\w+");
std::map<std::string, int> freq;
for (const auto& a : std::ranges::subrange(
std::sregex_iterator{ text.cbegin(),text.cend(), word_rx }, std::sregex_iterator{}
))
{
auto word = a.str();
transform(word.begin(), word.end(), word.begin(), ::tolower);
freq[word]++;
}
std::vector<std::pair<std::string, int>> pairs;
for (const auto& elem : freq)
{
pairs.push_back(elem);
}
std::ranges::sort(pairs, std::ranges::greater{}, &std::pair<std::string, int>::second);
std::cout << "Rank Word Frequency\n"
"==== ==== =========\n";
for (int rank=1; const auto& [word, count] : pairs | std::views::take(10))
{
std::cout << std::format("{:2} {:>4} {:5}\n", rank++, word, count);
}
}</lang>
{{out}}
<pre>Rank Word Frequency
==== ==== =========
0 the 41043
1 of 19952
2 and 14938
3 a 14539
4 to 13942
5 in 11208
6 he 9646
7 was 8620
8 that 7922
9 it 6659</pre>
=={{header|Clojure}}==
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