import java.util.Scanner;public class Main{ public static void main(String[] args){ Scanner scanner=new Scanner(System.in); System.out.println("小明上次成绩:"); double a=scanner.nextDouble(); System.out.println("小明这次成绩:"); double b=scanner.nextDouble(); double c=100*(b-a)/a; System.out.printf("小明成绩提高了:%.2f %%",c); //表示百分号时 用%% %+%表示 百分号 }}
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