char和int各种转换namespace ConsoleApplication7
{class Program{static void Main(string[] args){/*Console.WriteLine(int.MaxValue);Console.WriteLine(int.MinValue);Console.WriteLine((int)char.MaxValue);//65535，显式转换，以便于匹配WriteLine的int类型的重载Console.WriteLine((int)char.MinValue);//0char c='a';Console.WriteLine(c);int i = c;//把char隐式转换为int(int范围比char大)//只要把char数据隐式或者显式转换为int，得到的int就是char的ASCII码Console.WriteLine(i);*//*char c = (char)97;Console.WriteLine(c);int i = 98;char c1 = (char)i;Console.WriteLine(c1);*//*//'1'和1的区别char c1 = '1';//49int i1 = 1;//1int i2 = c1;Console.WriteLine(i2);Console.WriteLine(c1==i1);*//*char c1 = '0';char c2 = (char)(c1 + 2);//不能(char)c1+1Console.WriteLine(c2);char c3 = '5';char c4 = (char)(c3-2);Console.WriteLine(c4);*///Console.WriteLine(intToChar(5));//Console.WriteLine(charToInt('3'));Console.WriteLine(toUpper('d'));Console.ReadKey();}/// <summary>/// 把1转换为'1'，2转换为'2'/// </summary>/// <param name="i"></param>/// <returns></returns>        static char intToChar(int i) { if (i < 0 || i > 9) { throw new Exception("i必须在0-9之间"); } return (char)('0' + i);//i=3  } /// <summary> /// 把'1'转换为1 /// </summary> /// <param name="c"></param> /// <returns></returns> static int charToInt(char c) { //'0','1'....'9' if (c < '0' || c > '9')//判断是否是数字字符  { throw new Exception("不是合法的数字字符"); } return c - '0'; } //'a'→'A' static char toUpper(char c) { if (c < 'a' || c > 'z') { throw new Exception("不是小写字符"); } //'a':97,'A':65;'c':99,'C':67 //研究发现小写字符比大写字符大32 //return c //return (char)(c - 32); return (char)(c-('a'-'A')); } //任务：写一个转换为小写的方法  } }

  class Program{static void Main(string[] args){/*int i = 365;//就是三位数int sheng = 365;int ge = sheng % 10;// int ge = i % 10;Console.WriteLine("个位"+ge);//int sheng = i / 10;//36sheng = sheng / 10;Console.WriteLine("剩" + sheng);int shi = sheng % 10;Console.WriteLine("十位" + shi);sheng = sheng / 10;Console.WriteLine("剩" + sheng);int bai = sheng % 10;Console.WriteLine("百位"+bai);sheng = sheng / 10;Console.WriteLine("剩" + sheng);*//*int n = 3721886;int sheng = n;while (sheng != 0){int wei = sheng % 10;Console.WriteLine(wei);sheng = sheng / 10;}*/int n = 3721886;string s = n.ToString();//项目中哪个方便用哪个。面试的时候尽量不用.net内置的方法for (int i = 0; i < s.Length; i++){char ch = s[i];int iWei = ch-'0';//'1'→1//Console.WriteLine(ch);Console.WriteLine(iWei); } Console.ReadKey(); } }