(C#)while循环逻辑，如何计算直到value1到达value2会有多少次循环

Question

循环应该计算城镇人口大于或等于 currentPopulation 居民所需的年数。

int "initialPopulation" 年初人口数

double "percent" 每年增长的百分比。

int "visitors" 来小镇居住的访客（每年新增居民）。

int "currentPopulation" 当前人口。

所以我正在尝试 return 计算年数，但是无论 InitialPopulation 和 CurrentPopulation 之间有什么区别，循环只循环一次，我希望它也循环直到到达 CurrentPopulation。

那是我的问题，测试了教科书上的逻辑，应该真的通过了，所以要么我的逻辑坏了，要么我不明白某种 While 循环规则。

如果我的描述不太清楚，请评论。提前谢谢你。

        public static int GetYears(int initialPopulation, double percent, int visitors, int currentPopulation)
        {
            if (initialPopulation <= 0 || visitors < 0 || currentPopulation <= 0 || currentPopulation < initialPopulation)
            {
                throw new ArgumentException(null);
            }
            else if (percent < 0 || percent > 100)
            {
                throw new ArgumentOutOfRangeException(nameof(percent));
            }
            else
            {
                
                int countOfYear = 0;
                while (initialPopulation < currentPopulation)
                {
                    int surplus = ((int)(initialPopulation * percent) + visitors) - initialPopulation;
                    initialPopulation += surplus;
                    countOfYear++;
                }

                return countOfYear;
            }
        }
    }

Answer 1

你计算盈余的逻辑是错误的。您不需要减去初始人口。另外，将百分比除以 100。

        public static int GetYears(int initialPopulation, double percent, int visitors, int currentPopulation)
        {
            if (initialPopulation <= 0 || visitors < 0 || currentPopulation <= 0 || currentPopulation < initialPopulation)
            {
                throw new ArgumentException(null);
            }
            else if (percent < 0 || percent > 100)
            {
                throw new ArgumentOutOfRangeException(nameof(percent));
            }
            else
            {
                int countOfYear = 0;
                while (initialPopulation < currentPopulation)
                {
                    int surplus= (int)(initialPopulation * percent / 100 + visitors);
                    initialPopulation += surplus;
                    countOfYear++;
                }

                return countOfYear;
            }
        }

(C#)while循环逻辑，如何计算直到value1到达value2会有多少次循环

(C#) while loop logic, how to calculate how many loops there will be until value1 reaches value2

c#

algorithm

logic

loops

while-loop