问一下一个问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace chapter3._1
{
class Program
{
static void Main(string[] args)
{
//Usefor t = new Usefor();
//t.show();
//Car t = new Car(2,3);
//t.Info();
Console.Read();
}
}
}
在这个页面怎么样调用Stu类，
—
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace chapter3._1
{
class Car
{
int wheels;
protected float weight;
public Car (int w,float g)
{
wheels=w;
weight =g;
}
~Car()
{
}
public void Info()
{
Console.WriteLine(“{0}轮子”,wheels);
Console.WriteLine(“{0}kg重量”,weight);
}
public void Sprak()
{
Console.WriteLine(“能够加速”);
}
class stu
{
int sn;
float weight;
string name;
string sex;
public stu(int s,float w,string n,string se)
{
sn =s;
weight=w;
name =n;
sex =se;
}
~stu()
{
}
public void StuInfo()
{
Console.WriteLine(“学号：{0}”,sn);
Console.WriteLine(“体重：{0}”,weight);
Console.WriteLine(“姓名：{0}”,name);
Console.WriteLine(“性别：{0}”,sex);
}
};
}
}

解决方案

namespace chapter3._1
 {
     class Program
     {
         static void Main(string[] args)
         {
             stu s=new stu(1001,70.5,"张三","男");
             s.StuInfo();
             Console.Read();
         }
     }
 }

stu在car中，嵌套类，简单点就是把stu定义在car外面，就能直接实例访问了。

public class stu
        {
            int sn;
            float weight;
            string name;
            string sex;
            public stu(int s, float w, string n, string se)
            {
                sn = s;
                weight = w;
                name = n;
                sex = se;
            }
            ~stu()
            {
            }
            public void StuInfo()
            {
                Console.WriteLine("学号：{0}", sn);
                Console.WriteLine("体重：{0}", weight);
                Console.WriteLine("姓名：{0}", name);
                Console.WriteLine("性别：{0}", sex);
            }
        }
        static void Main(string[] args)
        {
            stu s = new stu(1001, 70.5f, "张三", "男");
            s.StuInfo();
            Console.Read();
        }

不改动位置就按下面调用

 static void Main(string[] args)
        {
          
            Car.stu s = new Car.stu(1001, 70.5f, "张三", "男"); //表示是car中的stu
            s.StuInfo();
            Console.Read();
        }

必须修改

 public class stu   //添加public

类成员的访问修饰符默认是private
所以stu的定义类外部应该是不可见的
要么你把stu的定义提到外面去，要么注明public
个人不喜欢嵌套声明类，一个cs文件声明多个类。