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× C++ Standard Library C++ STL Library


The C++ bitset::size function is used to return the number of bits in the bitset.

Syntax

size_t size() const;
constexpr size_t size() noexcept;

Parameters

No parameter is required.

Return Value

Number of bits present in the bitset.

Exception

Never throws exceptions.

Example:

In the below example, the bitset::size function is used to find out the number of bits in the given bitset.

#include <iostream>
#include <bitset>
using namespace std;
 
int main (){
  bitset<5> bset1;
  bitset<10> bset2;

  cout<<"bset1 contains "<<bset1.size()<<" bits.\n";
  cout<<"bset2 contains "<<bset2.size()<<" bits.\n";

  return 0;
}

The output of the above code will be:

bset1 contains 5 bits.
bset2 contains 10 bits.

❮ C++ <bitset> Library