Advanced Programming Techniques in C/

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The Utility of the AND Bitwise Operator

The Utility of the AND Bitwise Operator

Get introduced to the utility of & operator.

We'll cover the following...

The AND & operator is used to:

  • Check whether a bit is on or off
  • Switch off a particular bit

Check whether a bit is on or off

See the code given below!

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#include <stdio.h> 
# define BV(x) ( 1 << x) 
int main( ) 
{
  // Declare variables
	unsigned char n ; 
	unsigned int val ;
	n = 120;
  // Check 3rd bit is on or off
	if ( ( n & BV(3) ) == BV(3) ) 
	{
    // Display 3rd bit is on
		printf( "3rd bit is on\n" ) ; 
	}
  // Display 3rd bit is off
	else 
		printf ( "3rd bit is off\n" ) ;
}

To check whether the 3rd3^{rd} bit is on or off, we need to, first, select the appropriate mask ...

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