创建结点与分配内存 Function to create a Node. Allocates memory for a new node. 主动申请内存链表指针的写法

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

Self Referential Data Structure in C - create a singly linked list http://www.how2lab.com/programming/c/link-list1.php

#include <stdio.h>
typedef struct st {
int data;
struct st* s;
} alias;
alias *createNode() {
alias *new;
new=(alias *)malloc(sizeof(alias));
return new;
}
int main() {
alias a,*b;
b=createNode();
a.data=123;
b->data=456;
a.s=b;
printf("%d,",a.data);
printf("%d,",a.s->data);
return 1;
}

注意：

typedef struct st {
int data;
struct st *s;
} alias;

typedef struct st {
int data;
struct st* s;
} alias;

同

alias* createNode() {
alias *new;
new=(alias *)malloc(sizeof(alias));
return new;
}

alias *createNode() {
alias *new;
new=(alias *)malloc(sizeof(alias));
return new;
}

同

#include <stdio.h>
int* createInt() {
int *new;
new=(int *)malloc(sizeof(int));
return new;
}
int main() {
int *a;
int *b;
a=createInt();
b=createInt();
*a=123;
*b=456;
printf("%d,",*a);
printf("%d,",*b);
return 1;
}

#include <stdio.h>
int* createInt() {
int *new;
new=(int *)malloc(sizeof(int));
return new;
}
int main() {
int *a;
int* b;
a=createInt();
b=createInt();
*a=12;
*b=34;
printf("%d,",*a);
printf("%d,",*b);
return 1;
}

对指针变量的赋值

以下未报错

#include <stdio.h>
int* createInt() {
int *new;
new=(int *)malloc(sizeof(int));
return new;
}
int main() {
int *a;
/*
int* b;a=createInt();
b=createInt();
*/
a=12;
/*
*b=34;
printf("%d,",*a);
printf("%d,",*b);
*/
printf("CAN!,");
return 1;
}