Advanced Programming Techniques in C/

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Masks and Their Construction

Masks and Their Construction

Learn how to create mask values in C.

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Creating mask values

Suppose n = 45 and your task is to:

  • AND it with a number whose 3rd bit is on
  • OR it with a number whose 7th bit is on
  • XOR it with a number whose 4th bit is on

The original number is n; the second operand is known as a mask. Here, we intend to learn how to create mask values.

Example program 1: Creating mask values using a hexadecimal number

See the code given below!

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#include <stdio.h> 



int main( ) 

{

    // Initialize variables

	unsigned char n = 45 ; 

    unsigned x, y, z;

    // AND with number whose 3rd bit is ON

    x = n & 0x08;

    // OR with number whose 7th bit is ON

    y = n | 0x80;

    // XOR with number whose 4th bit is ON

    z = n ^ 0x10;

    // Display x, y, and z

	printf ( "%d\n", x ) ; 

    printf ( "%d\n", y ) ; 

    printf ( "%d\n", z ) ; 

}

Line 9: The mask in which 3rd3^{rd} ...