Thread: Alphabetize String

It's a one-liner.

Code:

std::sort(str.begin(), str.end());

Provided the data is in a std::string, not a C-style string. It can work on C-style strings too:

Code:

std::sort(str, str + strlen(str));

str is the name of the string you want to sort. It's both the input and the output.

Code:

#include <iostream>
#include <algorithm>
#include <string>

int main() {
    std::string str = "I love New York";

    std::cout << str << std::endl;
    std::sort(str.begin(), str.end());
    std::cout << str << std::endl;
}

Something like that.

Note that that won't convert the letters to lowercase. You'll have to do that yourself if you want to -- use tolower() or toupper() from <cctype>.

Originally Posted by wco5002

does it account for uppercase and lower case letter?

It treats any uppercase letter as coming "before" any lowercase letter. If you want it to disregard case, you need to write a special comparator.

Code:

struct compare_no_case
{
    bool operator()(char a, char b)
    {
        return tolower(a) < tolower(b);
    }
};

std::sort(str.begin(), str.end(), compare_no_case());