Untitled

 = with strings in C
string s = "hi";
s += " " + "there!";

error: invalid operands of types ‘const char [2]’ and ‘const char [6]’ to binary ‘operator+’

std::string("foo") + "bar"

s += string(" ") + "there!";

s += " "  "there!";

632 $ g++ foo.C
foo.C: In function ‘int main()’:
foo.C:5:16: error: invalid operands of types ‘const char [2]’ and ‘const char [7]’ to binary ‘operator+’

636 $ cat foo.C
#include <string>
using std::string;
int main(void){
    string s = "hi";
    s += string(" ") + string("there!");
    return 0;
}