取消对NULL指针的引用

取消对NULL指针的引用

//职工信息
typedef struct work
{
    int id;            //工号
    char name[8];      //姓名
    int wages;         //工资
    int bonus;         //奖金
    int deduction;     //扣款
    int money;         //实发工资
    struct work* next; //链表
}workers;

//表头
workers* Listhead()
{
    workers* head = (workers*)malloc(sizeof(workers));//动态内存申请 指针变成变量
    if (head != NULL)//消除vs警告
    {
        head->next = NULL;//初始化
        return head;
    }
    return 0;
}

//读取
void read(workers* head)
{
    workers* p = head;
    workers* temp = (workers*)malloc(sizeof(workers));
    FILE* fp = fopen("workers.txt", "r");
    if (fp == NULL)
    {
        fp = fopen("workers.txt", "w+");
    }
    while (fscanf(fp, "%d%s%d%d%d%d",
        &temp->id, temp->name, &temp->wages, &temp->bonus, &temp->deduction, &temp->money) != EOF)
    {
        if (p != NULL)
        {
            temp->next = NULL;
            p->next = temp;
            p = temp;
            temp = (workers*)malloc(sizeof(workers));
        }
    }
    fclose(fp);
}

怎么消除这个警告啊
邦邦！

这样写，供参考：

#include <stdio.h>
#include <stdlib.h>
//职工信息
typedef struct work
{
    int id;            //工号
    char name[8];      //姓名
    int wages;         //工资
    int bonus;         //奖金
    int deduction;     //扣款
    int money;         //实发工资
    struct work* next; //链表
}workers;

//表头
workers* Listhead()
{
    workers* head = (workers*)malloc(sizeof(workers));//动态内存申请 指针变成变量
    if (head != NULL)//消除vs警告
    {
        head->next = NULL;//初始化
        return head;
    }
    return 0;
}

//读取
void read(workers* head)
{
    workers* p = NULL;
    workers* temp = NULL;   //(workers*)malloc(sizeof(workers));
    FILE* fp = fopen("workers.txt", "r");
    if (fp == NULL)
    {
        printf("File open fail!\n");
        return;  //fp = fopen("workers.txt", "w+");
    }
    for (p = head;p->next;p = p->next);
    while (1){
        temp = (workers*)malloc(sizeof(workers));
        temp->next = NULL;
        if (fscanf(fp, "%d %s %d %d %d %d",&temp->id, temp->name,
            &temp->wages,&temp->bonus, &temp->deduction, &temp->money) != 6){
             free(temp);
             break;
        }
        p->next = temp;
        p = temp;
    }
    fclose(fp);
}

把&temp的&去掉就行