计算一组学生的平均成绩和不及格人数。要求使用结构体指针变量做函数参数编程，在函数中输出平均分和不及格人数，函数定义为void aver(struct student *ps)，结构体定义为struct student{ int num; char name[20]; char sex; float score;}stu[]={{101,"Li ping",'M',45}, {102,"Zhang ping",'M',62.5}, {103,"He fang",'F',92.5}, {104,"Chen ling",'F',87} }; 输出格式：printf("average=%fcount=%d",avers,c);输出样例：average=71.750000count=1