import java.util.*;

public class Size{
public static void main(String[] args)throws Exception{

Scanner s= new Scanner(System.in);
System.out.print("请输入第一个数：");
float a=s.nextFloat();
System.out.print("请输入第二个数：");
float b=s.nextFloat();
System.out.println("两个数的和是："+(a+b));
System.out.println("两个数的差是："+(a-b));
System.out.println("两个数的积是："+(a*b));
System.out.println("两个数的商是："+(a/b));
}
}