Java 在for循环之前初始化变量以用于for循环queston

我现在正在努力为学校熟悉for循环，并学习语法。我有几个问题。如果我要在循环中初始化变量，我怎么能要求用户在进入for循环之前输入变量值？这是我迄今为止为它编写的代码

我的扫描器在这段代码中也不适合我。我已经做了一点，所以我想可能需要再看一看

import java.util.Scanner;


public class forloop
{
    public static void main(String []args)
    {
        Scanner input = new Scanner(System.in);

        System.out.print("Enter your first of two numbers:");
        num1 = input.nextInt();
        System.out.print("Enter the second number:");
        num2 = input.nextInt();

        for(int num1 ; counter <= num2; counter ++)
        System.out.println("There are " + counter + " numbers between " + 
        num1 + " and " + num2);
    }
}

---

提前感谢您的帮助

您可以将用户的输入分配到临时变量中，然后在循环中将用户的输入初始化为这些临时变量

import java.util.Scanner;


public class forloop
{
public static void main(String []args)
{
    Scanner input = new Scanner(System.in);

    System.out.print("Enter your first of two numbers:");
    int temp1 = input.nextInt();
    System.out.print("Enter the second number:");
    int num2 = input.nextInt();

    for(int num1 = temp1; counter <= num2; counter ++)
    System.out.println("There are " + counter + " numbers between " + 
    num1 + " and " + num2);
}

---

}我认为这是最简单的解决方案：

public class forloop
{
    public static void main(String []args)
    {
        Scanner input = new Scanner(System.in);

        System.out.print("Enter your first of two numbers:");
        num1 = input.nextInt();
        System.out.print("Enter the second number:");
        num2 = input.nextInt();

        for(int x = num1 ; counter <= num2; counter ++)
        System.out.println("There are " + counter + " numbers between " + 
        num1 + " and " + num2);
    }
}

在for循环中的第一个表达式中，您需要声明控制循环的变量，并在本例中为其赋值-num1。在第二个表达式中，您需要设置循环不断迭代的条件-我不太确定计数器是什么意思。问题是这个变量尚未声明。您需要先声明，然后才能使用它。你希望你的程序做什么