querybyxuehao.c

C语言成绩管理系统

#include "stdio.h"
#define NULL 0
struct node
 {
    int data;
    struct node *next;
  };

struct node *creat();
struct node *delete(struct node *head,int value)
{ struct node *p,*q;
  p=head;
  if(head==NULL)
    { printf("这是一个空连接表！\n");
      return (head);
     }
  while((p->next!=NULL)&&(p->data!=value))
    {  q=p;p=p->next;}
    if(value==p->data)
     { if(head==p) head=p->next;
       else        q->next=p->next;
       free(p);
      }
    else
      printf("此链表没有数据%d!\n",value);
    return(head);
}
void main()
{
  struct node *q;
  int value;
  q=creat();
  printf("请输入要删除的数据:");
  scanf("%d",&value);
  q=delete(q,value);
  printf("The data of link:\n");
  while(q!=NULL)
   {
     printf("%d\t",q->data);
     q=q->next;
    }
  printf("\n");
  getch();
}