#define NULL 0

#define LEN sizeof(struct student)

struct student

{

long num;

float score;

struct student *next;

};

int n;

struct student *creat(void)//創建鏈表

{

struct student *head;

struct student *p1,*p2;

n=0;

p1=p2=(struct student*)malloc(LEN);

scanf("%ld,%f",&p1->num,&p1->score);

head=NULL;

while(p1->num!=0)

{

n=n+1;

if(n==1)head=p1;

else p2->next=p1;

p2=p1;

p1=(struct student *)malloc(LEN);

scanf("%ld,%f",&p1->num,&p1->score);

}

p2->next=NULL;

return(head);//帶回鏈表的頭指針

}

void print(struct student *head)//輸出鏈表

{

struct student *p;

printf("\nNow,there %d records are:\n",n);

p=head;

if(head!=NULL)

do

{

printf("%ld %5.1f\n",p->num,p->score);

p=p->next;

}

while(p!=NULL);

}

void averprintf(struct *head)//平均值輸出

{

struct student *p;

float aver,sum=0,high=0,low=0;

long num1;

printf("\nNow,the averge score is:\n");

p=head;

if(head!=NULL)

do

{

sum=sum+p->score;

p=p->next;

}

while(p!=NULL);

aver=sum/n;printf("%5.1f\n",aver);}

void highprintf(struct student *p)/*求最高分*/

{

int high=p->score;

long num1=p->num;

do {if (highscore)

{high=p->score;

num1=p->num;}

p=p->next ;}while (p!=NULL);

printf("\nThe highest score is:%d,and its number is:%ld\n",high,num1);}

void lowprintf(struct student *p)/*求最低分*/

{

int low=p->score;

long num1=p->num;

do{if (low>p->score)

{low=p->score;

num1=p->num;}

p=p->next;}while (p!=NULL);

printf("\nThe lowest score is:%d,and its number is:%ld\n",low,num1);}

void sort(struct student *head)//學生成績排序

{

struct student *p1,*p2;

float i;long t;

printf("Students from low to high ranking\n");

p1=head;

if(head==NULL)

{

printf("it is blank\n");

}

else

{

while(p1!=NULL)

{

p2=p1->next;

while(p2!=NULL)

{

if(p1->score>p2->score)

{

i=p2->score;

p2->score=p1->score;

p1->score=i;

t=p2->num;

p2->num=p1->num;

p1->num=p2->num;

}

p2=p2->next;

}

p1=p1->next;

}

}

while(p1!=0)

{

printf("%ld %5.1f\n",head->num,p1->score);

head->next;

}

}

struct student *del(struct student *head,long num)//刪除節點

{struct student *p1,*p2;

if(head==NULL){printf("\nlist null!\n");return head;}

p1=head;

while(num!=p1->num&&p1->next!=NULL)

{p2=p1;p1=p1->next;}

if(num==p1->num)

{if(p1==head)head=p1->next;

else p2->next=p1->next;

printf("delete:%ld\n",num);

n=n-1;

}

else printf("%ld not been found!\n",num);return(head);

}

struct student *insert(struct student *head,struct student *stud)//插入節點

{struct student *p0,*p1,*p2;

p1=head;

p0=stud;

if(head==NULL)

{head=p0;p0->next=NULL;}

else

{while((p0->num>p1->num)&&(p1->next!=NULL))

{p2=p1;p1=p1->next;}

if(p0->num<=p1->num)

{if(head==p1)head=p0;

else p2->next=p0;

p0->next=p1;}

else

{p1->next=p0;p0->next=NULL;}

}

n=n+1;

return(head);

}

void main()

{

struct student *head,*stu;

long del_num;

printf("input records:\n");

head=creat();

lowprintf(head);//加入排序，最高分，最低分調用函數

highprintf(head);

averprintf(head);

//刪除節點操作

print(head);sort(head);print(head);

printf("\ninput the deleted number:");

scanf("%ld",&del_num);

while(del_num!=0)

{head=del(head,del_num);

print(head);

printf("input the deleted number:");

scanf("%ld",&del_num);}

//插入節點操作

printf("\ninputthe insertd record:");

stu=(struct student *)malloc(LEN);

scanf("%ld,%f",&stu->num,&stu->score);

while(stu->num!=0)

{

head=insert(head,stu);

print(head);

printf("input the inserted record:");

stu=(struct student *)malloc(LEN);

scanf("%ld,%f",&stu->num,&stu->score);

}

}

總結

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