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  • leetcode系列---atoiFunction C#code

    Function:

     /// <summary>
            /// ToInt
            /// </summary>
            /// <param name="str"></param>
            /// <returns></returns>
            public static int atoi(string str)
            {
                string strNew = str.Trim();
                string ch = strNew.Substring(0, 1);
                string result = "";
                int bl = 0;
                double re;
                bool flag = true;
                for (int i = 1; i < strNew.Length; i++)
                {
                    string s = strNew.Substring(i, 1);
                    if (int.TryParse(s, out bl))
                    {
                        if (Convert.ToInt32(s) == 0)
                            continue;
                        switch (ch)
                        {
                            case "0":
                                result = result + s.ToString();
                                break;
                            case "+":
                                result = result + s.ToString();
                                break;
                            case "-":
                                flag = false;
                                result = result + s.ToString();
                                break;
                            default:
                                if (i == 1)
                                    result = result + ch.ToString();
                                result = result + s.ToString();
                                break;
                        }
                    }
                    else
                        break;
                }
                if (!string.IsNullOrEmpty(result))
                {
                    re = Convert.ToDouble(result);
                    if (!flag)
                        re = -re;
                    if (re < int.MinValue || re > int.MaxValue)
                        re = 0;
                }
                else
                    re = 0;
                return (int)re;
            }
    

    控制台展示:

    static void Main(string[] args)
            {
                Console.WriteLine("请输入要转化的字符串:");
                string str = Console.ReadLine();
                int re = atoi(str);
                if (re != 0)
                    Console.WriteLine("转化后:" + re);
                else
                    Console.WriteLine("该字符串不能转换为整数!");
                Console.ReadKey();
            }
    

      

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  • 原文地址:https://www.cnblogs.com/wqtmelo/p/8430588.html
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