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// bitset::any
#include <iostream> // std::cin, std::cout
#include <bitset> // std::bitset
int main ()
{
std::bitset<16> foo;
std::cout << "Please, enter a binary number: ";
std::cin >> foo;
if (foo.any())
std::cout << foo << " has " << foo.count() << " bits set.\n";
else
std::cout << foo << " has no bits set.\n";
return 0;
}
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