invalid operands to binary error

Question

in the first code is working, the second i just replaced the name which is declared string with a written string " whatever" , why shows this error ?
https://code.sololearn.com/cRa41co1m8IO/?ref=app
https://code.sololearn.com/c4hDYgnKwVou/?ref=app

Answer 1

In the first code, you are performing "+" operation between const char* and std::string which is a valid as it is overloaded in "string" class.

In second code you are performing "+" operation between 2 const char* which is an invalid operation in C/C++.

a simple fix is to type cast one of them to std::string 👇
https://code.sololearn.com/cieP70rT0PUP/?ref=app

Answer 2

nice , thank you for the fix

Answer 3

#include <iostream>
#include <string>
using namespace std;

string helloName (string name)
{

return "Hello" + name + "!" ;
}
int main() {

cout<<helloName("any name") ;

return 0;
}

*only put 'cout<< ' before helloname()f.