edition5chapt9_.cpp

#include <iostream>
#include <cstring>
#include <cctype>
// the library cstring is for string processing.
// cctype supports more functions
#include <string>
using namespace std;

void swap(char& v1, char& v2);
string reverse(const string& s);
string removePunct(const string& s, const string& punct);
string makeLower(const string& s);
bool isPalindrome(const string& s);

int main()
{
   string s1, s2("Hello ");
   cout << "Enter a line of input:\n";
    getline(cin, s1);
   if (s1 == s2 )
        cout << "Equal\n";
   else
        cout << "Not equal\n";
    return 0;
}

void swap(char& v1, char& v2)
{
    char temp;
    temp = v1;
    v1 = v2;
    v2 = temp;
}

string reverse(const string& s)
{
    int start = 0;
    int end = s.length();
    string temp(s);

    while (start < end)
    {
        end--;
        swap(temp[start], temp[end]);
        start++;
    }

    return temp;
    
}
string makeLower(const string& s)
{
    string temp(s);

    for (int i = 0; i < s.length(); i++)
    {
        temp[i] = tolower(s[i]);
    }

    return temp;
}
string removePunct(const string& s, const string& punct)
{
    string noPunct;
    int sLength = s.length();
    int punctLength = punct.length();

    for (int i = 0; i < sLength; i++)
    {
        string aChar = s.substr(i, 1);
        int location = punct.find(aChar, 0);

        if (location < 0 || location >= punctLength)
            noPunct = noPunct + aChar;
    }

   
    return noPunct;
}
bool isPalindrome(const string& s)
{
    string punct(",;:.?!'\" ");
    string str(s);
    str = makeLower(str);
    string lowerStr = removePunct(str, punct);
    
    return(lowerStr == reverse(lowerStr));
}