Golang和C指针异同点的对比

指针相同点

1.定义
通常我们把指针变量简称指针，简单直白点，指针变量就是用来存储内存地址的变量即为指针变量。
2. 用法

//C版本
#include<stdio.h>
int main(int argc, char *argv[]){
    int * p1;
    int a = 5;
    p1 =&a;
    printf("p1 value:%d",*p1);
}

//Golang版本
func main() {
	var p1* int
	a:=5
	p1=&a
	fmt.Println("p1 value is:",*p1)
}

// C版本
int main(int argc, char *argv[]) {
    int **outer;
    int *inter;
    int a = 3;
    inter = &a;
    outer = &inter;

	// memory address
    printf("%p\n", inter);
    printf("%p\n", *outer);
	// value
    printf("%d\n", *inter);
    printf("%d\n", **outer);
}

//Golang版本
func main() {
	var outer **int
	var inter *int
	a := 3
	inter = &a
	outer = &inter

	// memory address
	fmt.Println(inter)
	fmt.Println(*outer)
	// value
	fmt.Println(*inter)
	fmt.Println(**outer)
}

指针异同点

#include<stdio.h>
#include<malloc.h>
int main(int argc, char *argv[]){
    int *p1;
    p1 = (int*) malloc(sizeof(int));
    *p1 = 3;
    printf("p1 value:%d",*p1);
}

//Golang版本
func main() {
	var p1 *int
	p1 = new(int)
	*p1 = 3
	fmt.Println(*p1)
}

#include<stdio.h>
int main(int argc, char *argv[]){
    int i, *pa, a[] = {3,4,5,6,7,3,7,4,4,6};
    pa = a;
    printf("this is test:%d\n",*pa);
    for (i = 0; i <= 9; i++)
    {
        printf("%d\n", *pa);
        pa++; /*注意这里，指针值被修改*/
    }
}

func main() {
	var test *int
	a := [7]int{5, 2, 3, 6, 7, 8, 9}
	test=a //这种操作是非法的，会报错，不支持
	fmt.Println(*test)
}

#include<stdio.h>
int main(int argc, char *argv[]){
   int a = 111;
   double * f;
   f=(double *)&a;
}

package main

func main() {
 var a int = 111
 var f *float64
 f = *float64(&a)
}