What is bitset::size() function in C++?
The bitset::size() function in C++ is used to get the number of bits available in the bitset object. This function is available in the bitset header file.
Syntax
The syntax of bitset::size() function is shown below.
size_t& size();
Parameters
The function does not accept any parameters.
Return value
The function returns the number of bits present in the binary representation of the integer. The returned value is an unsigned integer value.
Code
Let’s have a look at the code.
#include <iostream>#include <bitset>using namespace std;int main() {bitset<4> b1 = 10;bitset<8> b2 = 110;cout << "Size of " << b1 << " : " << b1.size();cout << endl;cout << "Size of " << b2 << " : " << b2.size();return 0;}
Explanation
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In lines 1 and 2, we import the required header files.
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In lines 6 and 7, we create two
bitsetobjects having the capacity to store 4 and 8 bits respectively. This object will contain the binary representation of the integer 10 and 110 respectively. -
In line 9, we call the
size()function and print the size of the firstbitsetobject. -
In line 11, we repeat the same process.
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In the output, we can see the number of bits present in the two binary representations.
