Question

I use the code that allows me to convert any type (int, double, float, char) to string. I tested the program and choose char as type value.

stringstream ss;
    string s;
    char c = '3';
    ss << c;
    ss >> s;

    cout << "CHAR" << endl;
    bitset<8> bs2( (char) c );
    for( int i = (int) bs2.size(); i >= 0; i-- )
        cout << bs2[i] << " ";
    cout << endl;

    bitset<8> bs1( (char) s.c_str()[0]);
    cout << "STRING" << endl;
    for( int i = (int) bs1.size(); i >= 0; i-- )
        cout << bs1[i] << " ";
    cout << endl;

The output is

CHAR
0 0 0 0 0 0 0 1 1 
STRING
0 0 0 0 0 0 0 1 1 

But I found one strange thing. I set char c = ' ' and the value was not convert correctly.

CHAR
0 0 0 1 0 0 0 0 0 
STRING
0 0 0 0 0 0 0 0 0 

I could not find explanation for it and what I did wrong.

Answer 1

operator>> for std::string will only read until the first whitespace character encountered. If you want to extract all of the information in the std::stringstream, use the str() member function:

s = ss.str();

For reference see the description of operator>>(istream& s, string& str) and stringstream::str()