Is there any simple way to convert decimal system to binary system like i did with oct and hex?

Question

#include <iostream>
using namespace std;
int main () {
unsigned short A;
cout << "A = ";
cin >> A;
cout << oct << A<<endl;
cout<< hex<<A<<endl;

return 0;
}

Answer 1

Probably setbase

https://en.cppreference.com/w/cpp/io/manip/setbase

Answer 2

Unfortunately setbase is working just with bases 8, 10 and 16 or default (the base in iostream is not treated as a number, but as a set of flags). Your options (as far as i know) are:
a) writing your own output wrapper
b) output a bitset<WIDTH>(n) https://en.cppreference.com/w/cpp/utility/bitset/operator_ltltgtgt2
c) using itoa from stdlib.h, which, while available in most compilers, is nonstandard http://www.cplusplus.com/reference/cstdlib/itoa/