相关疑难解决方法(0)

我通常在python中编程.为了提高我的模拟性能,我正在学习C.在向链表实现追加函数时,我有一个问题需要理解指针指针的使用.这是我的书(由Kanetkar理解C指针)中的代码的摘录.

#include <stdlib.h>
#include <stdio.h>

struct node{
    int data;
    struct node *link;
};

int main(){
    struct node *p; //pointer to node structure
    p = NULL;   //linked list is empty

    append( &p,1);
    return 0;
}

append( struct node **q, int num){
    struct node *temp, *r;  //two pointers to struct node
    temp = *q;

    if(*q == NULL){
        temp = malloc(sizeof(struct node));
        temp -> data = num;
        temp -> link = NULL;
        *q = temp;
    }
    else{
        temp = *q;
        while( temp -> …