P161

#include<stdio.h>
#define N 8
typedef struct{
	char num[10];
	double s[N];
	double ave;
}STREC;
void fun(STREC *a)
{
	int i;
	a->ave=0;
	for(i=0;i<N;i++)
		a->ave=a->ave+a->s[i];
	a->ave=a->ave/N;
}
void main()
{
	STREC s={"GA005",85.5,76,69.5,85,91,72,64.5,87.5};
	int i;
	fun(&s);
	printf("The %s's student data :\n",s.num);
	for(i=0;i<N;i++)
		printf("%4.1f\n",s.s[i]);
	printf("\nave=%7.3f\n",s.ave);
}

P161