if 判断成绩 ，整百制

package day;
import java.util.Scanner;
public class Test_14 {
public static void main(String[] args){
//判断成绩 ，整百制
Scanner sc = new Scanner(System.in);
System.out.print("请输入成绩：");
int sum = sc.nextInt();
if(sum < 60){
System.out.println("学渣");
}else if(sum>=90 & sum<=100){
System.out.println("学霸真牛");
}else if(sum >= 80 & sum <= 89){//大于80且小于89
System.out.println("平平");
}else if(sum >= 70 & sum <= 79){
System.out.println("愤青");
}else if(sum >= 60 & sum <= 69){
System.out.println("分不在高,及格就行");
}else{
System.out.println("输入错误,请重新输入!");
}

}

}