题目是a=true,b=true,c=true,d=7;求 !a||d && b||c的值；
 static void Main(string[] args)
        {
            bool a,b, c,g;
            double d = 7;
           
            a = true;
            
            b = true;
           
            c = false;
           
            d = 7;
         
            g = !a||d && b||c;
            
            Console.WriteLine(":  {0}", g);

        }
提示错误信息：错误    1    运算符“&&”无法应用于“double”和“bool”类型的操作数   求指教！！！