How to create a mask in c

Last Updated: May 7, 2021 | Author: Dana-Henry

What is masking in C language?

Masking is the act of applying a mask to a value. This is accomplished by doing: Bitwise ANDing in order to extract a subset of the bits in the value. Bitwise ORing in order to set a subset of the bits in the value. Bitwise XORing in order to toggle a subset of the bits in the value.

How do masks work in C?

Masks. Bit strings and bitwise operators are often used to make masks . A mask is a bit string that “fits over” another bit string and produces a desired result, such as singling out particular bits from the second bit string, when the two bit strings are operated upon.

How do you make a bit mask in C++?

Bit Masking Explained with C++ samples
  1. To set n th bit ON. Bitwise OR (|) can be used for this purpose.
  2. To turn OFF nth bit. Bitwise AND (&) can be used for this purpose.
  3. To Toggle nth bit. number ^= 1 << n;
  4. To check whether nth bit is ON or OFF. bit = (number >> (n-1)) & 1;
  5. BitMasking.h. #include.
  6. BitMasking.cpp. // BitMasking.
  7. Sample. #include “stdafx.h”

What is bit masking with example?

For example, the mask 10000101 means that the subset of the set [1… 8] consists of elements 1, 3 and 8. We know that for a set of N elements there are total 2N subsets thus 2N masks are possible, one representing each subset. Each mask is, in fact, an integer number written in binary notation.

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