c++ - no viable conversion from 'value_type' (aka 'char') to 'string' (aka 'basic_string<char, char

string convert(string name) {   string code = name[0];   ... }

i "no viable conversion 'value_type' (aka 'char') 'string' (aka 'basic_string, allocator >')" line.

if change to:

string convert(string name) {   string code;   code = name[0];   ... }

then works. can explain why?

class std::string (correspondingly std::basic_string) has assignment operator

basic_string& operator=(chart c);

and assignment operator used in code snippet

string convert(string name) {   string code;   code = name[0]; // using of assignment operator   ... }

however class not has appropriate constructor write

string code = name[0];

you can write either like

string code = { 1, name[0] };

or like

string code( 1, name[0] );

using constructor

basic_string(size_type n, chart c, const allocator& = allocator());

Lix