2023.7.8

import java.util.Scanner;

public class test
{
     public static void  main(String[] args)
     {
         int i = 0;
         float f = 0.0f;

         Scanner scanner = new Scanner(System.in);

         System.out.println("请输入整数：");
         if(scanner.hasNextInt())
         {
             i = scanner.nextInt();
             System.out.println("整数数据为："+i);
         }
         else
         {
             System.out.print("输入的数据不是整数数据！");
         }
         //////////////////////////////////////////////////
         System.out.println("请输入小数：");
         if(scanner.hasNextFloat())
         {
             f = scanner.nextFloat();
             System.out.println("小数数据为："+f);
         }
         else
         {
             System.out.println("输入的数据不是小数数据！");
         }

         scanner.close();
     }
}

import java.util.Scanner;

public class test
{
     public static void  main(String[] args)
     {
         double sum = 0;//用于记录输入的总和
         double num = 0;//用于记录输入的个数

         Scanner scanner = new Scanner(System.in);
         while(scanner.hasNextDouble())
         {
             double x = scanner.nextDouble();
             num++;
             sum = sum+x;
         }
         System.out.println(num+"个数据的总和为："+sum);
         System.out.println(num+"个数据的平均值为："+sum/num);
         scanner.close();
     }
}