程序代码：

#include<stdio.h>
#include<stdlib.h>
#define N 8
struct slist
{  double s;
   struct slist *next;
} ;
typedef struct slist STREC;
double fun(STREC *h){
    double ave=0.0;
    STREC *p=h->next;
    while(p!=NULL){
        ave=ave+p->s;
        p=p->next;
    }
    return ave/N;
}
STREC *creat(double *s){
    STREC *h,*p,*q;
    int i=0;
    h=p=(STREC*)malloc(sizeof(STREC));
    p->s=0;
    while(i<N){
        q=(STREC*)malloc(sizeof(STREC));
        q->s=s[i];
        i++;
        p->next=q;  p=q;
    }
    p->next=0;
    return h;
}
void outlist(STREC *h)
{
    STREC *p;
    p=h->next;
    printf("head");
    do
    { 
      printf("->%4.1f",p->s);
      p=p->next;
    }while(p!=0);
    printf("\n\n");
}
main()
{
    double s[N]={85,76,69,85,91,72,64,87},ave;
    STREC *h;
    h=creat(s);
    outlist(h);
    ave=fun(h);
    printf("ave=%6.3f\n",ave);
}