bitset size() in C++ STL

bitset::size() is a built-in STL in C++ which returns the total number of bits.

Syntax:

bitset_name.size()

Parameter: The function accepts no parameter.

Return Value: The function returns an integral value which signifies the number of bits. It eventually returns the size that has been given while initializing the bitset.

Below programs illustrate the bitset::size() function.

Program 1:

// CPP program to illustrate the 
// bitset::size() function 
// when input is a string 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // initilization of the bitset string 
    bitset<4> b1(string("1100")); 
    bitset<6> b2(string("010010")); 
  
    // prints the size i.e., 
    // the number of bits in "1100" 
    cout << "The number of bits in " << b1 
         << " is " << b1.size() << endl; 
  
    // prints the size i.e., 
    // the number of bits in  "010010" 
    cout << "The number of bits in " << b2 
         << " is " << b2.size() << endl; 
  
    return 0; 
} 

Output:

The number of bits in 1100 is 4
The number of bits in 010010 is 6

Program 2:

// CPP program to illustrate the 
// bitset::flip() function 
// when input is a number 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // initilization of the bitset string 
    bitset<3> b1(5); 
    bitset<5> b2(17); 
  
    // prints the size i.e., 
    // the number of bits in 5 
    cout << "The number of bits in " << b1 
         << " is " << b1.size() << endl; 
  
    // prints the size i.e., 
    // the number of bits in 17 
    cout << "The number of bits in "
         << b2 << " is " << b2.size() << endl; 
  
    return 0; 
} 

Output:

The number of bits in 101 is 3
The number of bits in 10001 is 5

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