text_search.cpp File Reference

Search for words in a long textual paragraph. More...

#include <cassert>
#include <cstdlib>
#include <iostream>
#include <cstring>

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Functions
std::string	lower (std::string word)
	function to convert a C++ string to lower case
static void	test ()
	Self-test implementations.
int	main ()
	Main function.

Detailed Description

Search for words in a long textual paragraph.

Function Documentation

lower()

std::string lower

(

std::string

word

)

function to convert a C++ string to lower case

Parameters

word	takes an std::string as input

Returns

std::string

                                {
    int length = word.length();
    std::string lc = "";
 
    for (int i = 0; i < length; i++) {
        lc += tolower(word[i]);
    }
 
    return lc;
}

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main()

int main

(

void

)

Main function.

Returns

0 on exit

           {
    test();  // run self-test implementations
    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 {
        int ch = 0;
        while (true) {
            std::string word;
            std::cout << "Please enter the word you are searching for: ";
            std::getline(std::cin, word);
            std::cout << "Ignore case-sensitive? 1 = Yes, 0 = No" << std::endl;
            std::cin >> ch;
            if (ch == 1) {
                std::string lowerCase = lower(
                    paragraph);  // convert std::string paragraph to lowercase
                                 // and store it in std::string lowerCase
                std::string lowerCaseWord =
                    lower(word);  // convert std::string paragraph to lowercase
                                  // and store it in std::string lowerCase
 
                std::cout << "Hello, your word is " << word << "!\n";
                if (lowerCase.find(lowerCaseWord) == 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 "
                              << lowerCase.find(lowerCaseWord) << std::endl
                              << std::endl;
                }
            } else {
                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::cout << "\nPress Ctrl + C to exit the program.\n\n";
            std::cin.get();
        }
    }
    return 0;
}

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test()

static void test ( )

static

Self-test implementations.

Returns

void

                   {
    assert(lower("abcd").compare("abcd") == 0);
    assert(lower("abc").compare("abcd") == -1);
    assert(lower("abcd").compare("abc") == 1);
}

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