What is difference between logical negation and bitwise complement?
Logical negation - is represented as '!' and bitwise complement is represented as '~'. The logical negation evaluated over the entire Byte. If the value is non-zero, then the logical negation results in zero. Whereas, bitwise compliment compliments each bit in the byte.
Difference between logical Vs bitwise:
Logical negation operates on Boolean values, where it flips true to false and false to true. Bitwise complement operates at the binary level, flipping the individual bits in a binary number.
Logical negation and bitwise compliment are completely different operations. For example consider the following code snippet:
void main( void )
{
BYTE A = 0x01;
BYTE B = 0x02;
// Define 2LEDs
LED_1_Start();
LED_2_Start();
// Switch off all the LEDs
LED_1_Off();
LED_2_Off();
// As the value of A is non-zero, a logical negation results in zero.
// The expression evaluates as (0x00 & 0x02)=0x00 hence LED 1 is OFF
if(!A & B)
LED_1_On();
// Bitwise compliment of 0x01 results in 0xFE
// The expression evaluates as (0xFE & 0x02)=0x02 hence LED 2 is ON.
if(~A & B)
LED_2_On();
}
