Question

这是我从包含学生记录的链接列表的开头删除的代码。

    int delete (struct student **q) {
        struct student *current;
        current=(struct student *)malloc(sizeof(struct student));
        current=head;
        head=current->link;
        free(current);
        //display(current);
        return 1;
    }

这是结构

struct student
{
    int id;
    char name[10];
    char gender[10];
    struct student * link;
}*head;

但不是删除整个记录只有id被更改为0

before deletion
  ID       Name Gender
   1    Yazhini Female 
   2        Anu Female 
   3     Janavi Female 
   4    Haritha Female

删除后

  ID       Name Gender
   0    Yazhini Female 
   2        Anu Female 
   3     Janavi Female 
   4    Haritha Female

Answer 1

该功能可以按以下方式查看

int delete( struct student **head ) 
{
    int success = *head != NULL;

    if ( success )
    {
        struct student *current = *head;
        *head = current->link;
        free( current );
    }

    return success;
}

至于你的功能，它至少有一个内存泄漏，因为首先分配一个节点的内存，并将其地址分配给变量current

current=(struct student *)malloc(sizeof(struct student));

然后重新分配此变量。

current=head;

还不清楚参数q的含义。

从链接列表的开头删除

1 个答案: