Question

#include <iostream>
#include <string>
#include <fstream>

using namespace std;

int main() {
    string x;
    getline(cin,x);
    ofstream o("f:/demo.txt");
    o.write( (char*)&x , sizeof(x) );
}

I get the unexpected output.I don’t get what i write in a string function.
Why is this ?
Please explain .

Like when i write steve pro i get the output as 8/ steve pro ÌÌÌÌÌÌ ÌÌÌÌ in the file

I expect that the output be steve pro

Answer 1

You are treating an std::string like something that it is not. It’s a complex object that, somewhere in its internals, stores characters for you.

There is no reason to assume that a character array is at the start of the object (&x), and the sizeof the object has no relation to how many characters it may indirectly hold/represent.

You’re probably looking for:

o.write(x.c_str(), x.length());

Or just use the built-in formatted I/O mechanism:

o << x;