[Yugong series] July 2022 go teaching course 016 logical operators and other operators of operators

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One 、 Logical operators

Used to connect multiple conditions , In general, it's a relational expression , The end result is also a bool value .

1. The concept of logical operators

Operator	explain	Example
&&	Logic AND Operator . If the operands on both sides are True, Then the condition is True, Otherwise False	(A && B) by False
II	Logic OR Operator . If the operands on both sides have one True, Then the condition is True, Otherwise False	(A II B) by True
!	Logic NOT Operator . If the condition is True, Then logic NOT Conditions False, Otherwise True	!(A && B) by True

Related cases ：

package main

import "fmt"

func main() {
    
	var a bool = true
	var b bool = false
	if a && b {
    
		fmt.Printf(" first line  -  Condition is  true \n")
	}
	if a || b {
    
		fmt.Printf(" The second line  -  Condition is  true \n")
	}
	//  modify  a  and  b  Value 
	a = false
	b = true
	if a && b {
    
		fmt.Printf(" The third line  -  Condition is  true \n")
	} else {
    
		fmt.Printf(" The third line  -  Condition is  false \n")
	}
	if !(a && b) {
    
		fmt.Printf(" In the fourth row  -  Condition is  true \n")
	}
}

Two 、 Other operators

1. The concept of bitwise operators

Operator	explain	Example
&	If binary exists in both operands AND Operator , Then copy it to the result .	(A&B) The result is 12, That is to say 0000 1100
I	Binary system OR Operator copies a bit , If it exists in any of the operands .	(AIB) The result is 61, That is to say 0011 1101 ^ Binary system XOR Operator copy bit , If it is set in an operand , But not in two operands . (A^B) The result is 49, That is to say 0011 0001
<<	Binary left shift operator . The left operand moves left by the number of bits specified by the right operand .	A<<2 The result is 240, That is to say 1111 0000
>>	Binary right shift operator . The left operand moves to the right, and the number of digits specified by the right operand .	A>>2 The result is 15, That is to say 0000 1111

2. Concept of address dependent operators

Operator	explain	Example
&	Return the address of the variable	＆a The variable will be given a The actual address of .
*	Pointer to variable	*a Is pointing to variables a The pointer to .