Cannot convert string to char in c++?

Question

Does anybody know what's wrong with this code?

#include <iostream>
#include <stdio.h>

using namespace std;

int main()
{
string a;
getline(cin, a);
for(;;)
{
    string x;
    x=1;
    string b;
    getline(cin, b);
    string c;
    getline(cin, c);
    string d;
    d=a+b;
    string e;
    e=b+c;
    if(b=="1")
    {
        return 0;
    }
    rename(d, e);
}
}

It says that the error is on the

rename(d,e);

part. And it gives an error

cannot convert 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'const char*' for argument '1' to 'int rename(const char*, const char*)

So I'm assuming it can't convert string to char. Does anybody know how to do it and send the corrected part?

Thanks, why not post this as an answer too so I can give you an upvote. — LuckyFire
– LuckyFire, Commented Mar 1, 2020 at 20:45
You should have posted what rename does. All that can be seen in your post is the signature of rename. what @Sebastian Hoffmann says suits the signature, but does it produce the desired effect? — lakeweb
– lakeweb, Commented Mar 1, 2020 at 20:50
@lakeweb It's the rename from the C standard library (stdio.h) — Blastfurnace
– Blastfurnace, Commented Mar 1, 2020 at 21:10
@lakeweb it's std::rename , and askers don't need to post details of standard functions. You could look up documentation if unfamiliar with the function — M.M
– M.M, Commented Mar 1, 2020 at 21:18

M.M · Accepted Answer · 2020-03-01 21:20:12Z

2

There is no implicit conversion from std::string to char pointer, you need to invoke it via a function call:

rename( d.c_str(), e.c_str() );

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