Java - 如何使用while循环解决此计算

Question

我对过去的试卷中的问题感到困难.我正在尝试将from数字乘以n数字.换句话说:from*(from + 1)(from + 2)...*n.

我需要使用while循环来解决这个问题.到目前为止我已经这样做了,不知道该怎么做.我知道代码错了,但已经卡住了一段时间.

public class Fact {

    public int last;

    private int factPartND(final int from, final int n) {
        int fromNum = from;
        int toNum = n;
        int result = 1;
        int c = 1;

        while (fromNum <= toNum) {  // e.g.5*6*7*8*9*10*11
            result = (fromNum) * (fromNum + c);  // calculate 5*6
            final int temp = result;  // store 5*6
            int result1 = temp * (fromNum + c);  // store 5*6*7*....
            c++;  // increments the fromNum in the while code
            fromNum++;  // increments 5 to 11 in the while condition
            last = result1;
        }
        return last;
    }

    public static void main(String[] args) {
        Fact f = new Fact();
        System.out.println(test);
    }
}

Answer 1

我认为这应该作为while循环

int offset = 0;
int result = fromNum;
while (offset < toNum - fromNum) {
  offset++;
  result *= fromNum+offset;
}