Convert a single character to a string?

Question

Simple question (in C++):

How do I convert a character into a string. So for example I have a 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?

Answer 1

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));

Answer 2

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

string firstLetter(1,str[0]);

Answer 3

Here is the solution for both C and C++:

char* newStr = new char[1];
newStr[0] = str[0];
newStr[1] = '\0'

Answer 4

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

Answer 5

1) Using std::stringstream

  std::string str="abc",r;
  std::stringstream s;
  s<<str[0];
  s>>r;
  std::cout<<r;

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));

Answer 6

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"