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Go Language Pointer Capacity Go Structure and Pointer

Go Language Pointer Comparison

In Go language, comparing two pointers is allowed. Two pointer values are equal only if they point to the same value in memory or if they are both nil. You can compare pointers using the == and != operators provided by Go language:

1. == operator:If both pointers point to the same variable, this operator returns true. Or if both pointers point to different variables, it returns false.

Syntax:

pointer_1　== pointer_2

Example

package main
import \
func main() {
　　　　val1　:=　2345
　　　　val2　:=　567
　　　　//Create and initialize a pointer
　　　　var p1　*int
　　　　p1　= &val1
　　　　p2　:= &val2
　　　　p3　:= &val1
　　　　//Use the == operator to compare pointers
　　　　res1　:= &p1　== &p2
　　　　fmt.Println("p1Is the pointer equal to p2Pointer: ", res1)
　　　　res2　:= p1　== p2
　　　　fmt.Println("p1Is the pointer equal to p2Pointer: ", res2)
　　　　res3　:= p1　== p3
　　　　fmt.Println("p1Is the pointer equal to p3Pointer: ", res3)
　　　　res4　:= p2　== p3
　　　　fmt.Println("p2Is the pointer equal to p3Pointer: ", res4)
　　　　res5　:= &p3　== &p1
　　　　fmt.Println("p3Is the pointer equal to p1Pointer: ", res5)
}

Output:

p1Is the pointer equal to p2Pointer: false
p1Is the pointer equal to p2Pointer: false
p1Is the pointer equal to p3Pointer: true
p2Is the pointer equal to p3Pointer: false
p3Is the pointer equal to p1Pointer: false

2.！= operator:If both pointers point to the same variable, this operator returns false. Or if both pointers point to different variables, it returns true.

Syntax:

pointer_1　!= pointer_2

Example

package main
import \
func main() {
　　　　val1　:=　2345
　　　　val2　:=　567
　　　　//Create and initialize a pointer
　　　　var p1　*int
　　　　p1　= &val1
　　　　p2　:= &val2
　　　　p3　:= &val1
　　　　//　Use the != operator to compare pointers
　　　　res1　:= &p1　!= &p2
　　　　fmt.Println("p1Pointer is not equal to p2Is it a pointer: ", res1)
　　　　res2　:= p1　!= p2
　　　　fmt.Println("p1Pointer is not equal to p2Is it a pointer: ", res2)
　　　　res3　:= p1　!= p3
　　　　fmt.Println("p1Pointer is not equal to p3Is it a pointer: ", res3)
　　　　res4　:= p2　!= p3
　　　　fmt.Println("p2Pointer is not equal to p3Is it a pointer: ", res4)
　　　　res5　:= &p3　!= &p1
　　　　fmt.Println("p3Pointer is not equal to p1Is it a pointer: ", res5)
}

Output:

p1Pointer is not equal to p2Pointer?　　true
p1Pointer is not equal to p2Pointer?　　true
p1Pointer is not equal to p3Is it a pointer: false
p2Pointer is not equal to p3Pointer?　　true
p3Pointer is not equal to p1Pointer?　　true

Go Language Pointer Capacity Go Structure and Pointer