整数到双变量

Question

我需要创建一个程序，提示用户输入薪水并获得最高和最低薪水。我已经为此工作了 4 天了。我终于使用一些教程创建了我的程序在互联网上，但我只有一个问题......我无法将 INT 转换为 Double @@ 这让我很头疼......我哪里出错了？有人能帮我吗？我需要通过 java class ;;

代码如下：

import java.util.*;
public class HighestLowestSalary 
{
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        System.out.println("How many salary do you want to enter?: ");
        int sal = input.nextInt();

        //starting here should be double already..
        System.out.println("Enter the "+sal +" salaries");
        int[]salary = new int[sal];

        for (int i=0; i<sal; i++)
        {
            salary[i]=input.nextInt();
        }

        System.out.println("The Highest Salary is: " +high(salary));
        System.out.println("The Lowest Salary is: " +low(salary));
    }

    public static int high(int[] numbers)
    {
        int highsal = numbers[0];
        for (int i=1; i<numbers.length;i++){
            if (numbers[i] > highsal){
                highsal = numbers[i];
            }
        }
        return highsal;
    }

    public static int low(int[] numbers){
        int lowsal = numbers[0];
        for (int i=1;i<numbers.length;i++){
            if (numbers[i] < lowsal){
                lowsal = numbers[i];
            }
        }
        return lowsal;
    }

}

任何人都可以帮助我并教我如何将其转换为双倍？提前谢谢你..

Answer 1

您可以像这样将一个 int 值赋给 double：

int n = 1;
double j = n;
System.out.println(j);
Output:
1.0

注意：您可以使用 nextDouble api 而不是 nextInt

来要求薪水为双精度类型

Answer 2

呃……要将 int 转换为 double，您只需分配它即可。该赋值将导致 a "primitive widening conversion" 发生；参见 JLS 5.1.2。

int myInt = 42;
double myDouble = myInt;  // converts to a double.

（原始扩展转换不需要类型转换......虽然添加一个没有害处。）

将 int 数组转换为 double 数组....

int[] myInts = ....
double[] myDoubles = new double[myInts.length];
for (int i = 0; i < myInts.length; i++) {
    myDoubles[i] = myInts[i];
}

Answer 3

因为有您的帮助，我才得以解决问题！这是我所做的..就像每个人所说的将 int 转换为 Double

//this is where I changed all the int to double  

    System.out.println("Enter the "+sal +" salaries");
    double[]salary = new double[sal];

    for (int i = 0; i<sal; i++){
     salary[i] = input.nextDouble();
    }

    System.out.println("The Highest Salary is: " +high(salary));

    System.out.println("The Lowest Salary is: " +low(salary));
}

public static double high(double[] numbers)
{
 double highsal = numbers[0];
 for (int i=1; i<numbers.length;i++){
     if (numbers[i] > highsal){
         highsal = numbers[i];
     }
 }
return highsal;
}

public static double low(double[] numbers){
    double lowsal = numbers[0];
    for (int i=1;i<numbers.length;i++){
        if (numbers[i] < lowsal){
            lowsal = numbers[i];
        }
    }
    return lowsal;
}
}

整数到双变量

Integer to Double variable

java

arrays

variables

double

integer