public static void main(String[] args)
{ // TODO Auto-generated method stub
Scanner sc=new Scanner(System.in);
double a=sc.nextInt();
String c=sc.next();
double b=sc.nextInt();
double d=0;
if(c.equals("-")){ d=a-b;
} if(c.equals("*")){ d=a*b;
} if(c.equals("/")){ d=a/b;
} if(c.equals("+")){ d=a+b;
} System.out.println("输入数字"+d);
}
}
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