Comparative analysis of the differences between Go language and C language pointers

Go language and C language are two commonly used programming languages. They have certain differences in the use of pointers. This article will explain the difference between pointers in Go language and C language through specific comparative analysis and code examples.

1. Overview
Pointer is a special data type used to store variable addresses. It can be used to directly access data in memory. C language is a process-oriented programming language that is widely used in system-level programming and embedded development fields; while Go language is a statically typed, compiled, and concurrent high-level programming language that is widely used in cloud computing, Distributed systems and other fields.

2. Pointer declaration and assignment
In C language, declaring a pointer requires using the asterisk () symbol, while in Go language, declaring a pointer requires adding "#" before the type name. ##"symbol. The following is a code example for declaring and assigning pointers in C language and Go language:

C language example:

int main() {
    int a = 10;
    int *ptr;
    ptr = &a;
}

Go language example:

package main

import "fmt"

func main() {
    a := 10
    var ptr *int
    ptr = &a
}

3. Solution to pointers The dereference operation of a reference

pointer is used to obtain the value of the address pointed to by the pointer. In C language, an asterisk (
) is used to dereference a pointer; in Go language, an asterisk () is used to dereference a pointer.

C language example:

int main() {
    int a = 10;
    int *ptr;
    ptr = &a;
    printf("Value of a: %d", *ptr);
}

Go language example:

package main

import "fmt"

func main() {
    a := 10
    var ptr *int
    ptr = &a
    fmt.Printf("Value of a: %d", *ptr)
}

4. Null value processing of pointers

In C language, pointers can point to empty addresses (NULL ); and in Go language, nil is the representation of a null pointer.

C language example:

int main() {
    int *ptr = NULL;
}

Go language example:

package main

import "fmt"

func main() {
    var ptr *int
    fmt.Println(ptr == nil)  // 输出为true
}

5. Passing of pointers

In function parameter passing, in C language, pointers are passed to achieve Pass by reference; in Go language, you can pass a pointer directly or pass the address of a variable to achieve pass by reference.

C language example:

void change(int *ptr) {
    *ptr = 20;
}

int main() {
    int a = 10;
    change(&a);
}

Go language example:

package main

import "fmt"

func change(ptr *int) {
    *ptr = 20
}

func main() {
    a := 10
    ptr := &a
    change(ptr)
    fmt.Println(a)  // 输出为20
}

Summary:

Through the above comparative analysis and specific code examples, we can see that Go language and C Languages ​​have certain differences in pointer declaration, dereferencing, null value handling, and passing. When using pointers, programmers need to use them flexibly according to specific language features to achieve more efficient and stable programming. I hope this article will help readers understand the difference between pointers in Go language and C language.

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