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自我测验

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是七柒呀__

#1 Created at ... [Delete] [Delete and Lock User] 
import java.util.Scanner;public class Hello{    public static void main(String[] args){        Scanner in = new Scanner(System.in);        System.out.print("请输入你上次考试的成绩：");        int score_ago = in.nextInt();        System.out.print("请输入你这次考试成绩：");        int score_now = in.nextInt();        double rate = (score_now - score_ago)*1.0 / score_ago;        System.out.printf("你的成绩提高了%.2f%%", rate*100);    }}

郭兴超

#2 Created at ... [Delete] [Delete and Lock User] 
 System.out.printf("你的成绩提高了%.2f%%", rate*100);

这里为什么要用两个%?----%%

苏坡猪妮兒

#3 Created at ... [Delete] [Delete and Lock User]

这一章提到了，“注意，由于%表示占位符，因此，连续两个%%表示一个%字符本身。”

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