Duplicate Character Counter in C++

Duplicate Character

Counter in C++

Welcome to the Duplicate Character Counter in C++ page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

#include <array>
#include <format>
#include <iostream>
#include <string_view>

[[noreturn]] void usage() {
    std::cout << "Usage: please provide a string\n";
    std::exit(1);
}

int main(int argc, char* argv[]) {
    if (argc != 2) usage();

    std::string_view input{argv[1]};
    if (input.empty()) usage();

    std::array<std::size_t, 256> counts{};

    for (const auto c : input) {
        counts[c]++;
    }

    bool any_duplicates = false;

    for (const auto c : input) {
        if (counts[c] > 1) {
            std::cout << std::format("{}: {}\n", c, counts[c]);
            counts[c] = 0;
            any_duplicates = true;
        }
    }

    if (!any_duplicates) {
        std::cout << "No duplicate characters\n";
    }
}

Duplicate Character Counter in C++ was written by:

• Jeremy Grifski
• Vipin Yadav
• Ștefan-Iulian Alecu

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.