import java.io.*;
public class TestSign {
	public static void main(String[] args) throws IOException{
	float a=10f,b=5f,c=0.0f;
	char sign;
	System.out.println("ӷ(+)(-)˷(*)(/)ѡ");
	sign=(char)System.in.read();
	switch(sign)
	{
	  case '+':c=a+b; break;
	  case '-':c=a-b; break;
	  case '*':c=a*b; break;
	  case '/':c=a/b; break;
	  default:
	  {
		 System.out.println("Ŵ!");
		 c=-1.0f;
	  }
	}
	  if (c!=-1.0f)
	  System.out.println("a="+a+"b="+b+"c="+c);
	}
}
