& Amp; and & amp,

& Differences,

In programming, & is interpreted as: & is a logical operator, and & is a bitwise operator. But what are the differences in their usage?

1. When & and & are used as logical operators, let's see what they all do. See the following example:

1  int i = 8;2  int j = 8;3  int k = 8;4  int h = 8;5  bool a = (i > 5) && ((i = i + 5) > 10); //................(1)6  bool b = (j > 5) & ((j = j + 5) > 10);  //................(2)7  bool c = (k > 15) && ((k = k + 5) > 10);//................(3)8  bool d = (h > 15) & ((h = h + 5) > 10); //................(4)

See the output result:

For (1), if I> 5 is True and (I = I + 5)> 10 is True, a is True, that is, if both are True, a is True. At this time, I = 13.

For (2), if j> 5 is True and (j = j + 5)> 10 is True, B is True, that is, if both are True, a is True. In this case, j = 13.

For (3), if k> 15 is False and (k = k + 5)> 10 is True, c is False, that is, if it is set to True or False, c is set to False. K = 8.

For (4), if h> 15 is False and (h = h + 5)> 10 is True, d is False, that is, if the value is True or False, the value d is False. H = 13.

A sentence can be summarized as follows:

&: Logical and. If two values are True, they are True. If one value is False, they are False. That is, two are true, and one is false.

&: Logical and. If two values are True, True is used. If one value is False, False is used. That is, two are true, and one is false.

Differences:

Expression (1) & Expression (2). Expression (2) is executed only when expression (1) is True.

Expression (1) & Expression (2), whether expression (1) is True or False, expression (2) is executed.

2. When & acts as a bitwise operator, let's see what it does. See the following example:

1 int I = 6; // The binary value of 6 is 01102 3 I = I & 5; // The binary value of 5 is 0101.

See the output result:

When the & operator is a bit, bitwise operations are performed on 6 and 5, while the binary value of 6 is 0110, and the binary value of 5 is 0101. After logic &, the binary value of I is 0100, the corresponding decimal value is 4.