让用户输入小数的代码是什么 [英] What is the code to let the user input decimals

问题描述

package com.test;
 
import java.util.Arrays;
import java.util.Scanner;
 
public class SortArray
{
	public static void main(String [ ] args)
	{
		int numArray[] = new int[5];
		Scanner input = new Scanner(System.in);
		
		for(int i=0; i<numarray.length;i++)>
		{
			System.out.println("Enter five decimal numbers: ");
			numArray[i]= input.nextInt();
		}
		
		System.out.println("Array before sorting: " +Arrays.toString(numArray));
		Arrays.sort(numArray);
		System.out.println("Array after sorting: " +Arrays.toString(numArray));
	}
}

我的尝试：

What I have tried:

package com.test;
 
import java.util.Arrays;
import java.util.Scanner;
 
public class SortArray
{
	public static void main(String [ ] args)
	{
		int numArray[] = new int[5];
		Scanner input = new Scanner(System.in);
		
		for(int i=0; i<numarray.length;i++)>
		{
			System.out.println("Enter five decimal numbers: ");
			numArray[i]= input.nextInt();
		}
		
		System.out.println("Array before sorting: " +Arrays.toString(numArray));
		Arrays.sort(numArray);
		System.out.println("Array after sorting: " +Arrays.toString(numArray));
	}
}

推荐答案

如果你的意思是'十进制'数字，就像有'小数点'一样java中的类型可以是double或float - 所以，我会查看代码中的粗体位，如下所示并更改那些（有3个） - 您可能还需要考虑使用固定格式化输出数字＃小数点

if you mean a 'decimal' number as in having a 'decimal point' the type in java could be double or float - so, I would look at the bold bits in your code as shown below and alter those (there are 3) - you may also then need to think about formatting the output number with a fixed # of decimal points

package com.test;
 
import java.util.Arrays;
import java.util.Scanner;
 
public class SortArray
{
	public static void main(String [ ] args)
	{
		int numArray[] = new int[5];
		Scanner input = new Scanner(System.in);
		
		for(int i=0; i<numarray.length;i++)>
		{
			System.out.println("Enter five decimal numbers: ");
			numArray[i]= input.nextInt();
		}
		
		System.out.println("Array before sorting: " +Arrays.toString(numArray));
		Arrays.sort(numArray);
		System.out.println("Array after sorting: " +Arrays.toString(numArray));
	}
}

你也可以用字符串读取数字，但是你会有做类似的事情

you could also read the numbers in as a string, but then you'd have to do something like

String doubleAsString = "50.01";
Double myDouble = 0;
try
{
  myDouble = Double.parseDouble(doubleAsString);
}
catch(NumberFormatException e)
{
  //not a double
}

要解析的
要加倍的字符串

to parse the string to double

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