作者jeffchen106 (超哥)
看板C_and_CPP
标题[问题] Linked list incompatible pointer type
时间Fri Sep 17 19:53:42 2021
开发平台(Platform): (Ex: Win10, Linux, ...)
Win10
编译器(Ex: GCC, clang, VC++...)+目标环境(跟开发平台不同的话需列出)
https://www.onlinegdb.com/online_c_compiler
问题(Question)：
这个code主要是可以动态输入资料并且创建出Linked list, 并且还能够排序好.
这段code跑起来没有问题, 能够成功. 但不知道为什麽在上面提到的编译器编译
时一直出现多行warning: incompatible pointer size. 举其中两例如下:
newNodePtr->NextPtr = Headnode;
CurrentPtr = CurrentPtr->NextPtr;
希望能有热心的高手指点我一下，非常谢谢
错误结果(Wrong Output)：
撷取部分:
main.c:33:29: warning: assignment from incompatible pointer type
[-Wincompatible-pointer-types]
main.c:40:20: warning: assignment from incompatible pointer type
[-Wincompatible-pointer-types]
main.c:44:29: warning: assignment from incompatible pointer type
[-Wincompatible-pointer-types]
main.c:45:30: warning: assignment from incompatible pointer type
[-Wincompatible-pointer-types]
main.c:50:29: warning: assignment from incompatible pointer type
[-Wincompatible-pointer-types]
程式码(Code)：(请善用置底文网页, 记得排版，禁止使用图档)
// Online C compiler to run C program online
#include <stdio.h>
#include
<stdlib.h>
typedef struct node
{
int data;
int *NextPtr;
}Node;
Node *Headnode;
void insert_node(int element)
{
Node *PreviousPtr;
Node *CurrentPtr;
Node *newNodePtr = malloc(sizeof(Node));
Node *tempNode;
if(newNodePtr == NULL)
{
printf("Not enough space!");
return;
}
newNodePtr->data = element;
newNodePtr->NextPtr = NULL;
CurrentPtr = Headnode;
if(Headnode == NULL)
{
Headnode = newNodePtr;
return;
}
if(element < Headnode->data)
{
newNodePtr->NextPtr = Headnode;
Headnode = newNodePtr;
return;
}
while((element > (CurrentPtr->data)) && ((CurrentPtr->NextPtr) != NULL))
{
PreviousPtr = CurrentPtr;
CurrentPtr = CurrentPtr->NextPtr;
}
if(CurrentPtr->data > element)
{
newNodePtr->NextPtr = CurrentPtr;
PreviousPtr->NextPtr = newNodePtr;
}
else
{
newNodePtr->NextPtr = CurrentPtr->NextPtr;
CurrentPtr->NextPtr = newNodePtr;
}
return;
}
void Print_node()
{
Node *Currentnode;
Currentnode = Headnode;
printf(" %d -->", Currentnode->data);
while(Currentnode->NextPtr !=NULL)
{
Currentnode = Currentnode->NextPtr;
printf(" %d -->", Currentnode->data);
}
if(Currentnode->NextPtr == NULL)
printf("NULL");
}
int main()
{
int choice = 0;
int element;
Headnode = NULL;
int del_result;
printf("Enter your choice:\n");
printf("1 to insert an element into the list\n");
printf("2 to delete an element from the list\n");
printf("3 to end");
while(choice != 3)
{
printf("\n?");
scanf("\n%d", &choice);
switch(choice)
{
case 1:
printf("Enter a integer: ");
scanf("%d", &element);
insert_node(element);
Print_node();
break;
case 3:
printf("End of Run");
break;
}
}
return 0;
}
--
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※ 文章网址: https://webptt.com/cn.aspx?n=bbs/C_and_CPP/M.1631879624.A.1E2.html
※ 编辑: jeffchen106 (219.71.109.75 台湾), 09/17/2021 19:54:14
1F：推 j0958322080: 看起来是你的 next 型别那边有问题 09/17 20:29
2F：推 gusion: 你的NextPtr是指到int，应该要指到struct node才对 09/17 20:29
3F：→ jeffchen106: 对不起不是很懂>< 像第33行报warning的那边,NextPtr 09/18 07:16
4F：→ jeffchen106: 指到的是Headnode,那应该也算是指到struct node啊? 09/18 07:16
5F：推 pponywong: int* NextPtr; 改成 struct node* NextPtr; 09/18 08:54
6F：→ sarafciel: 你把月饼塞进巧克力蛋糕的纸盒拿去送人 就定义上来说 09/18 08:55
7F：→ pponywong: 这个用法是 struct 里面宣告 struct pointer type 09/18 08:55
8F：→ sarafciel: 你还是送了月饼没错 但人家会疑惑怎麽用巧克力蛋糕的外 09/18 08:56
9F：→ sarafciel: 盒也是很合理的呀 09/18 08:57
10F：→ wawi2: 用dummy head可以解决你code里的一堆NULL check 09/18 09:33
11F：→ jeffchen106: 感谢各位！我放进月饼盒之後果然warning解除了！ 09/18 15:31