Console.WriteLine("a & b={0}",a ,b);Console.WriteLine("a & b

Console.WriteLine("a & b={0}",a ,b);Console.WriteLine("a & b={0}",a &b); 输出的哪句对?Console.WriteLine("y"=+y);这句括号里面怎么解释?Console.WriteLine(b.TOString());这句中(b.TOString()什么意思?Console.WriteLine("j={0}",j);和Console.WriteLine("j=" + j);好像是一个意思对不对?