How to display a class field without using cout?

Question

C++ / C#

I have a class Class, it has private fields int* ptr, int size and void Print() method. Tell me, what standard function can be used to display the ptr array in the body of the Print() method without using the cout operator?

Answer 1

#include <cstdlib>
// ...
std::string command = "echo '";
command += your_data;
command += "'";
std::system(command);

The solution is not cross-platform and not secure, but why not?