C语言实现动态链表的创建、删除、插入、输出（CentOS6.5上调试成功）

该代码是基于网上其他代码修改而来，原来的代码有错误，以下是我修改后并在CentOS上调试成功的代码：

#include  <stdio.h>#include <stdlib.h>#include <unistd.h>#define LEN sizeof(struct student)struct student{    int num;    char name[10];    float score;    struct student *next;};static unsigned inode = 1;void fill(char c[], int n, char ch);//填充数组void del(struct student *ph, int n);//删除指定序号的节点void insert(struct student *ph, int n);//在指定序号后插入节点void output(struct student *ph);//输出所有节点struct student *input(void);//输入新节点void clearline(int n);//分割线int main(){        struct student *head,*ps,*pa,*pb;    int u;    char flag = 'y';    head = ps = pa = (struct student *)malloc(LEN);    fill(pa->name,10,'/0');    //输入数据，建立链表    while(flag != 'n'){                PRintf("please input student informations: /n");        printf("Num/tName/tScore/n");        scanf("%d %s %f", &pa->num, pa->name, &pa->score);        flag = getchar();        printf("Press any key input data continue, otherwise press n quit:");        flag = getchar();        if(flag != 'n'){            clearline(60);            pa->next = (struct student *)malloc(LEN);            pa = pa->next;            fill(pa->name,10,'/0');            inode++;        }    }            pa->next = NULL;    output(ps);          //删除节点    printf("which student's num do you want to del?/n");    printf("please input the num that you want to del:");    scanf("%d", &u);    if(u > inode){        printf("input error!/n");        exit(1);    }    if(u == 1){        pb = head;        ps = head->next;        free(pb);        head = pb = pa = ps;    }else        del(ps,u);    output(ps);    //插入节点    printf("which student's num do you want to insert after:");    scanf("%d",&u);    if(u>inode){        printf("input error!/n");        exit(1);    }    if(u == 0){        pb = head;        head = ps = pa = input();        pa->next = pb;        inode++;    }else{        insert(ps, u);    }    output(ps);    return 0;}void fill(char c[], int n, char ch){    int i;    for(i=0;i<=n;i++){        *(c+i) = ch;    }}void del(struct student *ph, int n){    int i;    struct student *pb,*pf;    pb = pf = ph;    for(i=1;i<=n-2;i++){        ph = ph->next;    }    if(n == inode){        pb = ph->next;        ph->next = NULL;        free(pb);    }else{        pb = ph->next;        ph->next = (ph->next)->next;        free(pb);    }    inode--;}void insert(struct student *ph, int n){    int i;    struct student *pa,*pb,*p_new,*ps;    ps = pa = ph;    p_new = (struct student *)malloc(LEN);    fill(p_new->name,10,'/0');    printf("please input the new student informations:/n");    printf("Num/tName/tScore:/n");    scanf("%d %s %f",&p_new->num,p_new->name,&p_new->score);    for(i=1;i<n;i++){        pa = pa->next;    }    pb = pa->next;    pa->next = p_new;    p_new->next = pb;    inode++;    }void output(struct student *ph){    int i;    struct student *pa;    printf("/n*****students list*****/n");    printf("Order/tNum/tName/tScore/n");        pa = ph;    for(i=1;pa!=NULL;i++){        printf("%d/t%d/t%s/t%.2f/n", i,pa->num,pa->name,pa->score);        pa=pa->next;    }    printf("totol %d /n",inode);   }struct student *input(void){    struct student *pa;    pa = (struct student *)malloc(LEN);    printf("please the new student information/n");    printf("Num/tName/tScore/n");    scanf("%d %s %f", &pa->num, pa->name, &pa->score);    return pa;}void clearline(int n){    int space;    printf("/r");    for(space=0;space<n;space++){        printf("-");    }    printf("/r");}
运行过程及结果：
please input student informations: Num     Name    Score1       aa      10Press any key input data continue, otherwise press n quit:yplease input student informations: -------------------------Num     Name    Score2       bb      20Press any key input data continue, otherwise press n quit:yplease input student informations: -------------------------Num     Name    Score3       cc      30Press any key input data continue, otherwise press n quit:n*****students list*****Order   Num     Name    Score1       1       aa      10.002       2       bb      20.003       3       cc      30.00totol 3 which student's num do you want to del?please input the num that you want to del:2*****students list*****Order   Num     Name    Score1       1       aa      10.002       3       cc      30.00totol 2 which student's num do you want to insert after:1please input the new student informations:Num     Name    Score:2       bb      20*****students list*****Order   Num     Name    Score1       1       aa      10.002       2       bb      20.003       3       cc      30.00totol 3 
结束