public static void main(String[] args) {
   System.out.print("请输入上次数学成绩:");
   Scanner scanner = new Scanner(System.in);
   double num1 = scanner.nextInt();
   System.out.print("请输入本次数学成绩:");
   double num2 = scanner.nextInt();
   double num3 = (num2-num1)/num1*100;
   System.out.printf("你本次成绩相对于上次成绩提升%.2f%%",num3);
  
  }