Convert a single character to a string?

Simple question (in C++):

How do I convert a single character into a string. So for example, I have string str = "abc";

And I want to extract the first letter, but I want it to be a string as opposed to a character.

I tried

string firstLetter = str[0] + "";

and

string firstLetter = & str[0]; 

Neither works. Ideas?

Off the top of my head, if you're using STL then do this:

string firstLetter(1,str[0]);

You can use the std::string(size_t , char ) constructor:

string firstletter( 1, str[0]);

or you could use string::substr():

string firstletter2( str.substr(0, 1));

1. Using std::stringstream

   std::string str="abc",r; std::stringstream s; s<>r; std::cout<

2. Using string ( size_t n, char c ); constructor

   std::string str="abc"; string r(1, str[0]);

3. Using substr()

   string r(str.substr(0, 1));

string s;
char a='c';
s+=a; //now s is "c"

or

char a='c';
string s(1, a); //now s is "c"

Use string::substr.

In the example below, f will be the string containing 1 characters after offset 0 in foo (in other words, the first character).

string foo = "foo";
string f = foo.substr(0, 1);

cout << foo << endl; // "foo"
cout << f << endl; // "f"

char characterVariable = 'z';
string cToS(1, characterVariable);

//cToS is now a string with the value of "z"

string firstletter(str.begin(), str.begin() + 1);

you can try this it works

string s="hello";

string s1="";

s1=s1+s[0];

If you want to return a string, there 2 ways to do this is given below:

1.`return (string) "" + S[i];

2.string s.push_back(originals[k];return s;