#include <stdio.h>
#define STUDENTS 5
 
typedef struct{
	int id;
	int eg;
	char cl;
}list;
void cls(list *data){
	for(int i=0;i<STUDENTS;i++){
		if(data[i].eg>=80){
			data[i].cl='A';
		}else if(data[i].eg>=70){
			data[i].cl='B';
		}else if(data[i].eg>=60){
			data[i].cl='C';
		}else{
			data[i].cl='D';
		}
	}
}
int main(void) {
	list data[]={{1,60},{2,80},{3,90},{4,70},{5,50}};
	cls(data);
	for(int i=0;i<STUDENTS;i++){
		printf("id:%d %c\n",data
[i
].
id,data
[i
].
cl); 	}
	return 0;
}
 
				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