Leetcode Series---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 = Res                            Ult + 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; }

Console display:

static void Main (string[] args)        {            Console.WriteLine ("Please enter a string to convert:");            String str = Console.ReadLine ();            int re = atoi (str);            if (Re! = 0)                Console.WriteLine ("After conversion:" + re);            Else                Console.WriteLine ("The string cannot be converted to an integer!") ");            Console.readkey ();        }

　　

Leetcode Series---atoifunction c#code