char to const char* with atof

[mickey]

Hello, I have this problem; it gets a runtime error. Why?

vector<double> vec;
string s =" 123213131313131331";
string::iterator it_s = s.begin();
for ( ; it_s != s.end(); ++it_s) {
     vec.push_back( (double) atof( (const char *) (*it_s) ) ); //runtime error
}

vector<double> vec;
string s =" 123213131313131331";
string::iterator it_s = s.begin();
for ( ; it_s != s.end(); ++it_s) {
     vec.push_back( (double) atof( (const char *) (*it_s) ) ); //runtime error
}

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