Sorting a string using STL - c++

Question

I am trying to sort the characters of a string using C++ STL and came up with this code.
#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
int main()
{
using namespace std;
vector<string>::iterator it;
string arr[] = {"jajajaj"};
vector<string> v(arr, arr+2);
sort(v.begin(), v.end());
for (it=v.begin(); it<v.end(); it++) {
cout << *it;
}
return 0;
}
But unfortunately its not sorting properly when the array contains single element. How to do it using STL.
Please help.

Answer 1

You can sort the string using std::string class.
#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
using namespace std;
int main()
{
string str = "jajajaj";
sort(str.begin(), str.end());
cout << str;
return 0;
}
Hope this might be helpful.

Answer 2

If you need a string, use a std::string :
(I used a for-range loop to make the code cleaner)
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
int main()
{
string s = {"jajajaj"};
sort(s.begin(), s.end());
for (auto c : s)
cout << c;
return 0;
}
Outputs:
aaajjjj
Note:
Your current code is not working because, as commented, you create a vector of size 2 out of an array of size 1, which has undefined behavior.

Answer 3

You seem to be confusing a std::string with an array of chars.
int main()
{
using namespace std;
string arr = "jajajaj";
vector<char> v(arr.begin(), arr.end());
sort(v.begin(), v.end());
vector<char>::iterator it;
for (it=v.begin(); it<v.end(); ++it) {
cout << *it;
}
return 0;
}
I haven't tested that, but it should work....
UPDATE:
Alternately, we could just sort the string's character directly: (Thanks guys!)
int main()
{
using namespace std;
string arr = "jajajaj";
sort(arr.begin(), arr.end());
cout << arr;
return 0;
}

Answer 4

You can use sort() function. sort() exists in algorithm header file
#include<bits/stdc++.h>
using namespace std;
int main()
{
ios::sync_with_stdio(false);
string str = "sharlock";
sort(str.begin(), str.end());
cout<<str<<endl;
return 0;
}
Output:
achklors

Answer 5

In order to sort a string, just input string from the user and use the sort() in STL for it.
#include<bits/stdc++.h>
using namespace std;
int main()
{
string arr;
cin >>arr;
sort(arr.begin(), arr.end());
cout <<arr;
}
See the sample image below for the output with input string as "Michael".