What will the below code do? C++ void function(int& num, int pos) { num |= (1 << pos); } C void setBit(int* num, int pos) { *num |= (1 << pos); } Java void setBit(int[] num, int pos) { num[0] |= (1 << pos); } Python def set_bit(num, pos): return num | (1 << pos) JavaScript function setBit(num, pos) { return num | (1 << pos); }

set the given position (pos) of a number (num).

Bitwise Algorithms and Manipulations

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Question 1

Which bitwise operator is used to swap two numbers?

A
Left Shift(<<)
B
Right shift(>>)
C
Bitwise OR |
D
Bitwise XOR ^

Question 2

What is the output of the below code for input num = 15?

C++

unsigned int fun(unsigned int n)
{
    unsigned int count = 0;
    while (n) {
        count += n & 1;
        n >>= 1;
    }
    return count;
}

unsigned int fun(unsigned int n) {
    unsigned int count = 0;
    while (n) {
        count += n & 1;
        n >>= 1;
    }
    return count;
}

Java

public class Main {
    public static int fun(int n) {
        int count = 0;
        while (n != 0) {
            count += n & 1;
            n >>= 1;
        }
        return count;
    }
}

Python

def fun(n):
    count = 0
    while n:
        count += n & 1
        n >>= 1
    return count

JavaScript

function fun(n) {
    let count = 0;
    while (n) {
        count += n & 1;
        n >>= 1;
    }
    return count;
}

A
15
B
5
C
4
D
3

Question 3

Which is the format specifier used to prefix 0x and print a number in hexadecimal notation.?

A
%O
B
%#
C
%x
D
%#x

Question 4

Which is the Bit Toggling operator below.?

A
Bitwise OR operator( | )
B
Bitwise XOR Operator (^)
C
Bitwise AND Operator(&)
D
TILDE operator(~)

Question 5

What is the output of the below expression?

000111 | 01010

A
0000000
B
00
C
010111
D
None

Question 6

Bitwise & can be used in conjunction with ~ operator to turn off 1 or more bits in a number.

A
True
B
False

Question 7

If we have to add two numbers without having any carry, which bitwise operator should be used?

A
Bitwise OR |
B
Bitwise AND &
C
Bitwise NOT ~
D
None

Question 8

Predict the output:

C++

#include <iostream>
using namespace std;

int main()
{
    int x = -5;
    x = x >> 1;
    cout << x << endl;
    return 0;
}

#include <stdio.h>

int main() {
    int x = -5;
    x = x >> 1;
    printf("%d\n", x);
    return 0;
}

Java

public class Main {
    public static void main(String[] args) {
        int x = -5;
        x = x >> 1;
        System.out.println(x);
    }
}

Python

# x is initialized to -5
x = -5
# Right shift operation
x = x >> 1
# Print the result
print(x)

JavaScript

// x is initialized to -5
let x = -5;
// Right shift operation
x = x >> 1;
// Print the result
console.log(x);

A
-2
B
-3
C
Error
D
-1

Question 9

What is the output of the below code?

C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
    if (~0 == 1)
        cout << "Yes";
    else
        cout << "No";
}

#include <stdio.h>
int main() {
    if (~0 == 1)
        printf("Yes");
    else
        printf("No");
    return 0;
}

Java

public class Main {
    public static void main(String[] args) {
        if (~0 == 1)
            System.out.println("Yes");
        else
            System.out.println("No");
    }
}

Python

if ~0 == 1:
    print("Yes")
else:
    print("No")

JavaScript

if (~0 === 1)
    console.log("Yes");
else
    console.log("No");

A
Yes
B
No
C
Error
D
None

Question 10

What will the below code do?

C++

void function(int& num, int pos) 
{
   num |= (1 << pos); 
}

void setBit(int* num, int pos) {
   *num |= (1 << pos); 
}

Java

void setBit(int[] num, int pos) {
   num[0] |= (1 << pos); 
}

Python

def set_bit(num, pos):
    return num | (1 << pos)

JavaScript

function setBit(num, pos) {
   return num | (1 << pos);
}

A
divide num by pos.
B
Multiply num by pos.
C
Add num with pos.
D
set the given position (pos) of a number (num).

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