c - 如何按字母顺序在列表中插入结构体

Question

嗯，我有一个代码可以按字母顺序在列表中插入一个新结构，但我遇到了一个小问题。我只需让它工作有一个函数，当我调用时，我使 head = Insert(frota* head, char name)。代码如下

typedef struct robot {
   int bateria;
   char nome[3];
   int pos_x;
   int pos_y;
   int target_x;
   int target_y;
   int limpos;
   int percorridos;
   struct robot * next;
}frota;

frota* Insert(frota* head, char name){
frota* temp = (frota*)malloc(sizeof(frota));
if(temp == NULL){
        printf("Unable to allocate memory for new node\n");
        exit(-1);
}
temp->nome[0] = 'R';
temp->nome[1] = name;
int* prevtemp = head;
int* nexttemp = head;
if(head != NULL)
    {
        // Corner Case: First on the list
        if(temp->nome[1] <= prevtemp->nome[1])
        {
            head = temp;
            temp->next = prevtemp;
        }
        else
        {
            // CASE: Somewhere between the first and the list
            while(nexttemp->next != NULL)
            {
                nexttemp = nexttemp->next;
                if(temp->nome[1] >= prevtemp->nome[1] && temp->nome[1] <= nexttemp->nome[1])
                {
                    prevtemp->next = temp;
                    temp->next = nexttemp;
                    break;
                }
                prevtemp = prevtemp->next;
            }

            // Corner Case: end of list
            if(nexttemp->next == NULL)
            {
                nexttemp->next = temp;
            }
        }
    }
    else 
    {
        // Corner Case: We had an empty list
        head = temp;
    }
}

我的问题是如何使代码正常工作并直接更改值头的值，从而使该函数成为一个过程。我尝试过的代码是这样的:

void Insert(frota* head, char name){
frota* temp = (frota*)malloc(sizeof(frota));
if(temp == NULL){
        printf("Unable to allocate memory for new node\n");
        exit(-1);
}
temp->nome[0] = 'R';
temp->nome[1] = name;
int* prevtemp = *head;
int* nexttemp = *head;
if(*head != NULL)
    {
        // Corner Case: First on the list
        if(temp->nome[1] <= prevtemp->nome[1])
        {
            *head = temp;
            temp->next = prevtemp;
        }
        else
        {
            // CASE: Somewhere between the first and the list
            while(nexttemp->next != NULL)
            {
                nexttemp = nexttemp->next;
                if(temp->nome[1] >= prevtemp->nome[1] && temp->nome[1] <= nexttemp->nome[1])
                {
                    prevtemp->next = temp;
                    temp->next = nexttemp;
                    break;
                }
                prevtemp = prevtemp->next;
            }

            // Corner Case: end of list
            if(nexttemp->next == NULL)
            {
                nexttemp->next = temp;
            }
        }
    }
    else 
    {
        // Corner Case: We had an empty list
        *head = temp;
        (*head)->next = NULL;
    }
}

这样我将过程称为 Insert(&head,name)。任何帮助将不胜感激。当我运行代码时，它出现段错误，而不是内存错误 PS:该代码不完全由我负责，在网上找到了一些部分......

感恩

Answer 1

对于初学者:

改变

int* prevtemp;

成为

struct robot * prevtemp;

(与 nexttemp 相同)

<小时/>

全部更改

head

到

(*head)

<小时/>

全部更改

frota

至

struct robot