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

bitset set() function in C++ STL

Last Updated : 18 Jun, 2018

is a built-in STL in C++ which sets the bit to a given value at a particular index. If no parameter is passed, it sets all bits to 1. If only a single parameter is passed, it sets the bit at that particular index to 1.

set(int index, bool val) 

The function accepts two parameters which are described below:

1. index - this parameter specifies the position at which the bit has to be set. The parameter is an optional one.
2. val - this parameter specifies a boolean value which has to bet set at the index. The parameter is an optional one.
If no parameter is passed, it sets all bits to 1. If only a single parameter is passed, it sets the bit at that index.

The function does not return anything. Below programs illustrates the bitset::set() function.

// CPP program to illustrate the
// bitset::set() function
// when parameter is not passed

#include <bits/stdc++.h>
using namespace std;

int main()
{
    // Initialization of bitset
    bitset<4> b1(string("1100"));
    bitset<6> b2(string("100100"));

    // Function that resets all bits
    cout << "Before applying set() function: "
         << b1 << endl;

    b1.set();
    cout << "After applying set() function: "
         << b1 << endl;

    // Function that resets all bits
    cout << "Before applying set() function: "
         << b2 << endl;

    b2.set();
    cout << "After applying set() function: "
         << b2 << endl;

    return 0;
}

Before applying set() function: 1100
After applying set() function: 1111
Before applying set() function: 100100
After applying set() function: 111111

// CPP program to illustrate the
// bitset::set() function
// when parameter is passed

#include <bits/stdc++.h>
using namespace std;

int main()
{
    // Initialization of bitset
    bitset<4> b1(string("1100"));
    bitset<6> b2(string("100100"));

    // Function that resets all bits
    cout << "Before applying set() function: "
         << b1 << endl;

    // single parameter is passed
    b1.set(1);
    cout << "After applying set(1) function: "
         << b1 << endl;

    // Function that resets all bits
    cout << "Before applying set() function: "
         << b2 << endl;

    // both parameters is passed
    b2.set(2, 0);
    b2.set(4, 1);
    cout << "After applying set(2, 0) and"
         << " set(4, 1) function: " << b2 << endl;

    return 0;
}

Before applying set() function: 1100
After applying set(1) function: 1110
Before applying set() function: 100100
After applying set(2, 0) and set(4, 1) function: 110000

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