How do I turn on a specific bit?

The idea is to use bitwise << and | operators. Using expression “(1 << (k – 1))“, we get a number which has all bits unset, except the k’th bit. If we do bitwise | of this expression with n, we get a number which has all bits same as n except the k’th bit which is 1.

How do you swap two bits of an integer?

Method 1: The idea is to first find the bits, then use XOR based swapping concept, i..e., to swap two numbers ‘x’ and ‘y’, we do x = x ^ y, y = y ^ x and x = x ^ y.

What operator would you use to turn on a bit?

Toggling a bit The XOR operator ( ^ ) can be used to toggle a bit.

How do you toggle nth bits?

Step by step descriptive logic to toggle nth bit of a number.

Input number and nth bit position to toggle from user. Store it in some variable say num and n .
Left shift 1 to n times, i.e. 1 << n .
Perform bitwise XOR with num and result evaluated above i.e. num ^ (1 << n); .

How do you flip a bit in C++?

bitset::flip() is a built-in STL in C++ which flips the bits. If no parameter is passed in the function, then it flips all the bit values converting zeros to ones and ones to zeros. If a parameter position is passed, it flips the bit at the position only.

What does it mean to toggle a bit?

Toggling a bit means that if K-th bit is 1, then change it to 0 and if it is 0 then change it to 1.

How do you reverse the bit of a number?

# Function to reverse bits of a given integer.
def reverseBits(n):
pos = SIZE – 1 # maintains shift.
# store reversed bits of `n`. Initially, all bits are set to 0.
reverse = 0.
# do till all bits are processed.
while pos >= 0 and n:
# if the current bit is 1, then set the corresponding bit in the result.

How do I change the alternate bits in a number?

To swap the bits subtract and add corresponding values….

Get all even bits of x by doing bitwise and of x with 0xAAAAAAAA.
Get all odd bits of x by doing bitwise and of x with 0x55555555.
Right shift all even bits.
Left shift all odd bits.
Combine new even and odd bits and return.

What does 1ul mean?

unsigned long
1ul means (unsigned long)1 – number 1 that is unsigned long. Without ul will be int (16 bits) << 11 means scroll left 11 bits – by other words set bit 11 to 1. So, 1ul << 11 will be binary number: 00000000000000000000100000000000.

How do I turn on a specific bit?