Palindrome

[greengirl1968]

OK, what I have got so far works well enough, but it will not ignore capitalization. What do I do?

#include <string>
#include <algorithm>
#include <iostream>
using namespace std;
int main()

{

cout << "Please Enter The Suspected Palindrome:";

string s;

cin >> s;

if( equal(s.begin(), s.begin() + s.size()/2, s.rbegin()) )

cout << "This is a palindrome.";

else

cout << "This is not a palindrome.";

cout << "\n\n";

system ("pause");

return 0;

}

[JayhawkZombie]

Try converting every character to the same case (upper/lower) and then running your test.

[Handy Andy]

greengirl1968

Add this bit of code that I found and it should solve your problem.

#include <locale> // heder file to use the loc variable

locale loc;
for (int lp = 0; lp < s.length(); lp++)
{
	s[lp] = tolower(s[lp], loc);
}

Not that I know many palindromes to test this with, but it did work.

Hope that helps

Andy

PS
Forgot to mention this should go after the cin and before the if statement.

[JLBorges]

#include <string>
#include <algorithm>
#include <iostream>
#include <cctype>
#include <iomanip>

std::string sanitise( const std::string& str ) // remove non-alphanumeric, convert to all lower case
{
    std::string result ;
    for( char c : str ) if( std::isalnum(c) ) result += std::tolower(c) ;
    return result ;
}

int main()
{
    std::cout << "Please Enter The Suspected Palindrome: ";

    std::string str ;
    std::getline( std::cin, str ) ;

    std::cout << "\nThe string " << std::quoted(str) << " is " ;

    str = sanitise(str) ;
    if( std::equal( str.begin(), str.begin() + str.size()/2, str.rbegin() ) ) std::cout << "a palindrome.\n";
    else std::cout << "is not a palindrome.\n";
}

http://coliru.stacked-crooked.com/a/b5c98c1e805f78d7

[greengirl1968]

Thank you all very much that helped greatly.