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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_bitset_default_constructor.htm below:

C++ Bitset Default Constructor

The C++ constructor std::bitset::bitset() constructs bitset container and initialize it with zero.

Following is the declaration for std::bitset::bitset() constructor form std::bitset header.

bitset();

constexpr bitset() noexcept;

None

Constructor never returns value.

This member function never throws exception.

The following example shows the usage of std::bitset::bitset() constructor.

#include <iostream>
#include <bitset>

using namespace std;

int main(void) {
   bitset<4>b;

   cout << b << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

0000

bitset.htm

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