PTA 按等级统计学生成绩
![在这里插入图片描述](https://img-blog.csdnimg.cn/20210321161136298.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podXJvdXdhbnpp,size_16,color_FFFFFF,t_70)
int set_grade( struct student *p, int n ){
int i,count=0;
for(i=0;i<n;i++){
if((*p).score<60){
(*p).grade='D';
count++;
}else if((*p).score<70){
(*p).grade='C';
}else if((*p).score<85){
(*p).grade='B';
}else if((*p).score<=100){
(*p).grade='A';
}
p++;
}
return count;
}