完整代码应该如下:using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace sd
{
class Program
{
public static void Main()
{
int a;
a = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("{}", a);
}
}
}
int.Parse("123456");
a = Convert.ToInt32(Console.ReadLine());