How concatenate a string and a const char?

c++, string

Solution

string a = "hello ";
const char *b = "world";
a += b;
const char *C = a.c_str();

or without modifying `a`:

string a = "hello ";
const char *b = "world";
string c = a + b;
const char *C = c.c_str();

Little edit, to match amount of information given by 111111.

When you already have `string`s (or `const char *`s, but I recommend casting the latter to the former), you can just "sum" them up to form longer string. But, if you want to append something more than just string you already have, you can use `stringstream` and it's `operator<<`, which works exactly as `cout`'s one, but doesn't print the text to standard output (i.e. console), but to it's internal buffer and you can use it's `.str()` method to get `std::string` from it.

`std::string::c_str()` function returns pointer to `const char` buffer (i.e. `const char *`) of string contained within it, that is null-terminated. You can then use it as any other `const char *` variable.

Problem

Original source