C++ convert char to const char*

Question

Basically i just want to loop through a string of characters pull each one out and each one has to be of type const char* so i can pass it to a function. heres a example. Thanks for your help.

    string thestring = "abc123";
    const char* theval;
    string result;

    for(i = 0; i < thestring.length(); i++){
        theval = thestring[i]; //somehow convert this must be type const char*
        result = func(theval);
    }

Answer 1

You can take the address of that element:

theval = &thestring[i];

Answer 2

string sym(1, thestring[i]);
theval = sym.c_str();

It gives a null-terminated const char* for every character.

Answer 3

Usually a const char * is pointing to a full null-terminated string, not a single character, so I question if this is really what you want to do.

If it's really what you want, the answer is easy:

theval = &thestring[i];

If the function is really expecting a string but you want to pass it a string of a single character, a slightly different approach is called for:

char theval[2] = {0};
theval[0] = thestring[i];
result = func(theval);