switch()문을 이용한 계산기 만들기

ex) 

static void Main(string[] args)          {              int in_num1 = 0, in_num2 = 0, sum = 0;              string in_oper;//사칙연산 연산자              Console.WriteLine("첫 번째 숫자를 입력하세요");              //입력받은 문자열을 int형으로 형변환 후 in_num1에 저장              in_num1 = int.Parse(Console.ReadLine());              //입력받은 문자열을 int형으로 형변환 후 in_num2에 저장              Console.WriteLine("두 번째 숫자를 입력하세요");              in_num2 = int.Parse(Console.ReadLine());              //입력받은 문자열을 in_oper에 저장              Console.WriteLine("사친연산 연산자를 입력하세요");              in_oper = Console.ReadLine();              //문자열이므로 " "로 작성              switch (in_oper)              {                  case "+":                      sum = in_num1 + in_num2;                      Console.WriteLine("{0} + {1} = {2}", in_num1, in_num2, sum);                      break;                  case "-" :                      sum = in_num1 - in_num2;                  Console.WriteLine("{0} - {1} = {2}", in_num1, in_num2, sum);                      break;                  case "*" :                      sum = in_num1 * in_num2;                  Console.WriteLine("{0} * {1} = {2}", in_num1, in_num2, sum);                      break;                  case "/" :                      sum = in_num1 / in_num2;                  Console.WriteLine("{0} / {1} = {2}", in_num1, in_num2, sum);                      break;                  default :                      Console.WriteLine("사칙연산자를 잘못 입력하였습니다.");                      break;              }          }