c#的输入不熟，求指导，为什么b输入不了

Question

            int a, b, sum;

            Console.WriteLine("请输入第一个数字：");

            a = Console.Read();

            Console.WriteLine("请输入第二个数字：");

            b = Console.Read();

            sum = a + b;

            Console.WriteLine("两个数的和是：" + sum);

Answer 1

                 int a = 0, b = 0, sum;                Console.WriteLine("请输入第一个数字：");                a = Convert.ToInt32(Console.ReadLine());                Console.WriteLine("请输入第二个数字：");                b = Convert.ToInt32(Console.ReadLine());                sum = a + b;                Console.WriteLine("两个数的和是：" + sum);输入后需要换行，才能输出内容

Answer 2

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