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Showing content from https://www.geeksforgeeks.org/cpp/bitset-operator-in-c-stl/ below:

bitset operator[] in C++ STL

Last Updated : 12 Nov, 2020

bitset::operator[] is a built-in function in C++ STL which is used to assign value to any index of a bitset.

Syntax:

bitset_operator[index] = value

Parameter: The parameter index specifies the position at which the value is to be assigned.

Return Value: The function returns the value to the bit at the index.

Below programs illustrate the bitset::operator[] function.

Program 1:

C++


 // C++ program to illustrate the
// bitset::operator[]
#include <bits/stdc++.h>
using namespace std;

int main()
{
    // Initialization of bitset
    // by zeros of size 6
    bitset<6> b;

    // initialises second index as 1
    b[2] = 1;

    // initialises fifth index as 1
    b[5] = 1;

    // prints the bitset
    cout << "The bitset after assigning values is: " << b;
    return 0;
}

Output:

The bitset after assigning values is: 100100

Program 2:

C++


 // C++ program to illustrate the
// bitset::operator[]
// assign value from a index
#include <bits/stdc++.h>
using namespace std;

int main()
{
    // Initialization of bitset
    // by zeros of size 6
    bitset<6> b;

    // initialises second index as 1
    b[2] = 1;

    // initialises fifth index as the same as b[2]
    b[3] = b[2];

    b[0] = b[5];
    
    // prints the bitset
    cout << "The bitset after assigning values is: " << b;
    return 0;
}

Output:

The bitset after assigning values is: 001100

Program 3:

C++


 // C++ program to illustrate the
// bitset::operator[]
// prints the value of bit at index
#include <bits/stdc++.h>
using namespace std;

int main()
{
    // Initialization of bitset
    // by zeros of size 6
    bitset<6> b;

    // initialises second index as 1
    b[2] = 1;

    // initialises fifth index as the same as b[2]
    b[3] = b[2];

    b[0] = b[5];
    
    
    cout << "The bit value at index 3 is " << b[3];
    return 0;
}

Output:

The bit value at index 3 is 1

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