iostream
Input/Output Stream. The C++ equivalent of stdio. It provides the cin(input), cout(output), and cerr(error) stream objects.
// hello world program
#include <iostream>;
int main()
{
std::cout << "Hello, world!" << std::endl;
return 0;
}
#include <iostream>;
int main()
{
std::cout << "Hello, world!" << std::endl;
return 0;
}