How do you set a bit at a given position?

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

1. Input number from user. Store it in some variable say num .
2. Input bit position you want to set. Store it in some variable say n .
3. To set a particular bit of number. Left shift 1 n times and perform bitwise OR operation with num .

How do I change a specific bit in C++?

Setting a bit Use the bitwise OR operator ( | ) to set a bit. number |= 1UL << n; That will set the n th bit of number . n should be zero, if you want to set the 1 st bit and so on upto n-1 , if you want to set the n th bit.

How do I change the alternate bits of a given number?

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

How do I remove a KTH bit?

C++ program to clear Kth bit of a number

1. Input the number and Kth bit to be cleared.
2. Left shift 1 – (K-1) times to create a mask where only Kth bit is set.
3. Take bitwise complement of the mask.
4. Perform bitwise AND of original number with this mask to clear the Kth bit.
5. Output the result after bitwise AND in decimal form.

How do I disable KTH bit?

Given a number n and a value k, turn off the k’th bit in n. Please note that k = 1 means the rightmost bit. The idea is to use bitwise <<, & and ~ operators. Using expression “~(1 << (k – 1))“, we get a number which has all bits set, except the k’th bit.

How do you flip a bit?

To flip one or more bits, use binary XOR. In your case, the appropriate XOR mask is 1 shifted k bits to the left. is valid in C, Java, Python and a few other languages (provided the variables are appropriately defined). Left-shift the number 1 the number of digits you need, and then XOR the number.

What is bit mask in C?

Bit masking is simply the process of storing data truly as bits, as opposed to storing it as chars/ints/floats. It is incredibly useful for storing certain types of data compactly and efficiently. a XOR b – if one value is 1 and the other value is 0, the final value is 1, otherwise the final value is 0.

How can I swap two numbers using Bitwise Operators?

Java Program to Swap Two Numbers Using Bitwise Operator

1. Find the binary equivalent of given variables, say X and Y.
2. Find X^Y and store it in x, i.e. X = X ^ Y.
3. Again, find X^Y and store it in Y, i.e. Y = X ^ Y.
4. Find X^Y and store it in X, i.e. X = X ^ Y.
5. The numbers are swapped.

How do I change bits in Java?

[4][1][2][3][0] public static int swap(int i, int pos1, int pos2) { int bit1 = (i >> pos1) & 1;// bit at pos1 int bit2 = (i >> pos2) & 1;// bit at pos2 if (bit1 == bit2) return i; // no need to swap since we change 1 with 1 or 0 with 0 // Since we are here it means that we need to change 1->0 and 0->1. // To do this we …

How do you modify a bit?

1. Setting a bit. Use the bitwise OR operator ( | ) to set a bit. number |= 1 << x; That will set a bit x .
2. Clearing a bit. Use the bitwise AND operator ( & ) to clear a bit. number &= ~(1 << x); That will clear bit x .
3. Toggling a bit. The XOR operator ( ^ ) can be used to toggle a bit. number ^= 1 << x;

How do you flip a bit in Python?

How do you set a bit in bitwise OR?

Since we all know that performing bitwise OR of any bit with a set bit results in a set bit, i.e. Any bit Set bit = Set bit which means, 0 | 1 = 1 1 | 1 = 1 So for setting a bit, performing a bitwise OR of the number with a set bit is the best idea. N = N | 1 << K OR N |= 1 << K where K is the bit that is to be set

How do you modify a bit at a given position?

Modify a bit at a given position. Given a number n, a position p and a binary value b, we need to change the bit at position p in n to value b. Examples : Input : n = 7, p = 2, b = 0 Output : 3 7 is 00000111 after clearing bit at 2rd position, it becomes 0000011.

Why do we use binary instead of an integer for bitwise operations?

You can also use any integer, eg: However, it makes it harder to know which bit is being changed. Using binary allows you to see which exact bits will be set/erased/toggled. (1 << y) shifts the …001 y places left, so you can move the set bit y places.

What is the difference between setting a bit and clearing a bit?

Setting a bit means that if K-th bit is 0, then set it to 1 and if it is 1 then leave it unchanged. Clearing a bit means that if K-th bit is 1, then clear it to 0 and if it is 0 then leave it unchanged. 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.