java:如何计算变量差值中所有值之间的乘法

Question

我收到了那个任务: 》编写一个小方法，calculateProduct。它会要求用户输入两个int值，然后计算并显示输入的两个值之间所有值的乘积。例如，如果用户输入数字2和5程序将显示结果120(计算为2 * 3 * 4 * 5)”

我尝试构建这样的东西:

import java.util.Scanner;

public class Exam {

public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    int a;
    int b;
    int big;
    int small;
    //ask to insert two variables
    System.out.println("Insert variable a");
    a = in.nextInt();
    System.out.println ("Insert variable b");
    b=in.nextInt();
    // compare two variables
    // set the biggest variables to b, the smallest - to a
    if (a >=b){
        big=a;
        small=b;
    }
    else {
        big=b;
        small=a;
    }
    // set the do while loop to complete the code. Run multiplying before counter won't fit to b variable
    int result = small;
    for (int i=small; i<=big;i++){
        result*=i;
    }
    System.out.println("the multiplication progression between "+small+" and "+big+" equals to "+result);

}

}

但是，当我插入 2 和 5 时，结果是 240。有人知道如何修复它吗？谢谢!

Answer 1

将循环更改为:

for (int i = small + 1; i <= big; i++)
{
  result *= i;
}