TheAlgorithms-C-Plus-Plus/search/text_search.cpp

/**
 * \file
 * \brief Search for words in a long textual paragraph.
 */
#include <cstdlib>
#include <iostream>
#ifdef _MSC_VER
#include <string>  // required for MS Visual C++
#else
#include <cstring>
#endif

/** Main function
 */
int main()
{
    std::string paragraph;
    std::cout << "Please enter your paragraph: \n";
    std::getline(std::cin, paragraph);
    std::cout << "\nHello, your paragraph is:\n " << paragraph << "!\n";
    std::cout << "\nThe size of your paragraph = " << paragraph.size()
              << " characters. \n\n";

    if (paragraph.empty())
    {
        std::cout << "\nThe paragraph is empty" << std::endl;
    }
    else
    {
        while (true)
        {
            std::string word;
            std::cout << "Please enter the word you are searching for: ";
            std::getline(std::cin, word);
            std::cout << "Hello, your word is " << word << "!\n";
            if (paragraph.find(word) == std::string::npos)
            {
                std::cout << word << " does not exist in the sentence"
                          << std::endl;
            }
            else
            {
                std::cout << "The word " << word << " is now found at location "
                          << paragraph.find(word) << std::endl
                          << std::endl;
            }
            std::cin.get();
        }
    }
}