The difference between logic and (&) and by-bit and (&)

For a long time, the difference between logic and (&) is not very definite. I went online today and wroteCodeThe differences are as follows for discussion.

1. When all operands are numbers

A. after bitwise AND (&) are performed on two numbers, the two numbers are converted to binary values, and then right-aligned (the digits are not filled with zeros, for example, the binary representation of 11 & 11 is, And the binary representation of 3 is 11. After right alignment and operation ,:

The result is 3.

B. for the logic and (&) of the two numbers, both operands are converted to the Boolean logical value (if the value is not 0, the value is true; otherwise, the value is false ), and then proceed with the operation.

The Demo code is as follows:

Static void main ()

{

Int I = 11; // The binary is: 1011

Int J = 3; // The binary value is: 0011.

 

Int num = I & J;

Int num1 = convert. toint32 (convert. toboolean (I) & convert. toboolean (j ));

 

Console. writeline ("bitwise AND result: {0}", num );

Console. writeline ("logic and Result: {0}", num1 );

}

2. the operand is not a number. It is the equation or method that returns the logical value.

A. For bitwise AND (&), all operands are judged. Let's take a look at the Demo code:

Static void main ()

{

If (3 = 5 & returntrue ())

{

Console. writeline ("the result is true ");

}

}

 

Static bool returntrue ()

{

Console. writeline ("executing the returntrue method ");

Return true;

}

The output result is:Execute the returntrue Method

The analysis is as follows:Equation 3 = 5 returns false results. We know from the output results that the returntrue () method is still executed when Equation 3 = 5 returns false, output result "execute returntrue method"

B. For logic and (&), the operands are determined one by one. When they do not match, the subsequent operands are no longer judged. Let's take a look at the Demo code:

Static void main ()

{

If (3 = 5 & returntrue ())

{

Console. writeline ("the result is true ");

}

}

 

Static bool returntrue ()

{

Console. writeline ("executing the returntrue method ");

Return true;

}

This Code does not output any results.

The analysis is as follows:Equation 3 = 5 returns false results. We know from the output results that the returntrue () method is not executed when Equation 3 = 5 returns false.

The result is:3.