AUT_AP_2025_Spring Homework 2

Deadline: 3th of Esfand - 23:59 o'clock

1st Question: Variadic Template Sum (with String-Based Numbers)

Objective

Implement a function template sum that accepts any number of arguments of different types (integers, floating points, and string-based numbers) and returns their sum.

This exercise will reinforce your understanding of variadic templates, parameter packs, type conversion, and compile-time recursion or fold expressions.

Task Details

• Use template parameter packs to allow an arbitrary number of arguments.
• Ensure the function can handle a mix of:
  • Integer values (int, long, etc.)
  • Floating-point numbers (float, double)
  • String-based numbers (std::string) that contain valid numeric values (e.g., "42", "3.14").
• Convert string-based numbers to numeric values before summation.
• Use SFINAE (std::enable_if) or C++20 concepts to ensure only valid numerical inputs are processed.
• Optional: Optimize performance by utilizing std::string_view where appropriate to avoid unnecessary string copies.

Example Usage

std::cout << sum(1, 2.5, 3, "4.5") << std::endl;  // Output: 11
std::cout << sum("10", 20, "30") << std::endl;    // Output: 60
std::cout << sum(3.14, "2.86") << std::endl;      // Output: 6

2nd Question: Word Frequency

Objective

Develop a function that counts the frequency of words in a given text string efficiently.

This exercise will improve your skills in text processing, C++ Standard Library containers.

Task Details

• Use std::map<std::string, int> to store word frequencies.
• Ensure that the function correctly handles punctuation and case sensitivity.

Example Usage

std::string text = "Hello world! This is a test. hello again, world.";
std::map<std::string, int> wordCounts = countWords(text);

for (const auto& [word, count] : wordCounts) {
    std::cout << word << " -> " << count << '\n';
}

// Expected output:
// hello -> 2
// world -> 2
// this -> 1
// is -> 1
// a -> 1
// test -> 1
// again -> 1

Final Step: How To Test Your Program

If you want to debug your code, set the if statement to true. This will allow you to place your debugging code in the designated section. Once you're done with the debugging process, remember to set the if statement back to false to test your program using the provided unit-test.cpp.

#include <iostream>
#include <gtest/gtest.h>

#include "Q1_Variadic_Template_sum.h"
#include "Q2_Word_Frequency.h"


int main(int argc, char **argv)
{
    if (true) // Set to false to run unit-tests
    {
        // Debug section: Place your debugging code here
    }
    else
    {
        ::testing::InitGoogleTest(&argc, argv);
        std::cout << "RUNNING TESTS ..." << std::endl;
        int ret{RUN_ALL_TESTS()};
        if (!ret)
            std::cout << "<<<SUCCESS>>>" << std::endl;
        else
            std::cout << "FAILED" << std::endl;
    }
    return 0;
}

Best Regards, Afi