Convert a single character to a string?

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<<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));

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

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

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