#include <stdio.h>
 
int main(void) {
	// your code goes here
	return 0;
}
 

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#include<stdio.h>

int main()
   int mark
   printf("请输入成绩:");
    scanf("%d",& mark);

     if(mark>=90 && mark<=100){
      printf("优秀\n");
}     else if(mark>=80 && mark <=89){
      printf("良好\n");
}     else if(mark>=70 &&  mark <=79){
      printf("中等\n");
}     else if(mark>=60 &&  mark <=69){
      printf("及格\n");
}     else if(mark>=0 &&   mark <=60){
      printf("不及格\n");
}      else {
      printf ("输入有误\n");
}