Eg1. public class Ex4{
public static void main(String args []){
int score = 90 ;
if (score > 85 && score <=100){
System.out.println("优");
}
else if (score > 75 && score <=85){
System.out.println("良");
}
else if (score > 60 && score <=75){
System.out.println("中");
}
else if (score <=60 && score >=0){
System.out.println("差");
}
else if (score > 100 && score < 0){
System.out.println("成绩错误");
}
}
}