std::cin input with spaces?

Question

#include 

std::string input;
std::cin >> input;

The user wants to enter \"Hello World\". But cin fails at the spa

Answer 1

How do I read a string from input?

You can read a single, whitespace terminated word with std::cin like this:

#include
#include
using namespace std;

int main()
{
    cout << "Please enter a word:\n";

    string s;
    cin>>s;

    cout << "You entered " << s << '\n';
}

Note that there is no explicit memory management and no fixed-sized buffer that you could possibly overflow. If you really need a whole line (and not just a single word) you can do this:

#include
#include
using namespace std;

int main()
{
    cout << "Please enter a line:\n";

    string s;
    getline(cin,s);

    cout << "You entered " << s << '\n';
}