CODEWITHSUNDEEP
c++
dwvaxaz
dwvaxaz

Reputation: 49

Ignoring punctuation, white space and capital letters in palindrome validation

So far my program prompts the user to enter a string and then read from start to end and backwards and compares both results. Obviously, if they are equal it's a palindrome, if not - it ain't.

#include <iostream>
#include <stdio.h>

using namespace std;

int main(){

    string input;

    cout << "Enter a string: ";
    cin >> input;

    if (input == string(input.rbegin(), input.rend())) {
        cout << "Yes";
    } else {
        cout << "No";
    }

    return 0;
}

Question is, how do I omit things like whitespaces, punctuation etc so that I can use sentences and check them if are a palindrome or not?

Upvotes: 1

Views: 1399

Answers (1)

user1804599
user1804599

Reputation:

Just process the input first:

#include <algorithm>
#include <boost/algorithm/string/case_conv.hpp>
#include <cctype>

input.erase(
    std::remove_if(input.begin(), input.end(),
                   [] (char c) { return std::isspace(c) || std::ispunct(c); }),
    input.end()
);
boost::algorithm::to_lower(input);

Upvotes: 4

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