//先上代码

#include<stdio.h>
#include<stdlib.h>

struct work
{
       int data;
       struct work *next;
};

typedef struct work myfun;


void show(struct work*);
void delet(struct work*,int);

int main()
{
    myfun *head=NULL;
    myfun *current,*prev;
    myfun *change;
    int i=10;
   
    int c=5;
   
   
    while(i<=30)
    {
        current=(struct work*)malloc(sizeof(struct work));
        
        if(head==NULL)
        {
            head=current;
        }
        
        else
        {
            prev->next=current;
        }
        
        current->data=i;
        
        i=i+10;
        
        current->next=NULL;
        
        prev=current;
    }
   
    printf("The original list is: \n");
    show(head);
   
    printf("The list after 5 deleted is: \n");
    delet(head,c);
   
    show(head);
   
   
    system("pause");
    return 0;
}

void show(struct work *current)
{
     while(1)
     {
        printf("%d\n",current->data);
        if(current->next==NULL)
        {
            break;
        }
        current=current->next;
        
    }
}
void delet(struct work *current,int x)
{
     struct work *change;
     while(1)
     {
         if(current->data==x)
         {
             current=current->next;
             break;
         }
         
         else if((current->next)->data==x)
         {
              change=current->next;
              current->next=(current->next)->next;
              free(change);
              break;
         }
         else
         {
             current=current->next;
         }
     }
}

不知道为什就是没有办法删掉第一个，虽然题目要求删的是值为20的，可是就是搞不明白，因为我已经考虑了要删除第一个的情况了，可是就是不行

你那里删除第一个？
if(current->data==x)
         {
             current=current->next;
             break;
         }
你改变的不过是current 而不是head

我已经知道了，谢谢