看看程序哪里错了

[ytyytryrtyryr]

求助下 帮我看看程序哪里错了

#include<iostream>
using namespace std;
class dog
{
public:
void set(int g,double w);
dog(int g=0,double w=5);
~dog();
int getage()
{
return age;
}
double getweight()
{
return weight;
}


private:
int age;
double weight;
};

dog::dog(int g,double w)
{ age=g;
weight=w;
}



dog::~dog()
{
}



int main()
{
dog jack(2,10);
cout<<"jack is a dog who is ";
cout<<jack.getage()<<"years old and "<<jack.getweight<<"pound weight"<<endl;
jack.set(7,20);
cout<<"now jack is ";
cout<<jack.getage()<<"years old and "<<jack.getweight<<"pound weight"<<endl;

return 0;
}


老运行不过出现
Linking...
4-8 dog.obj : error LNK2005: _main already defined in 4-8 dog 2.obj
4-8 dog.obj : error LNK2001: unresolved external symbol "public: void __thiscall dog::set(int,double)" (?set@dog@@QAEXHN@Z)
Debug/4-8 dog 2.exe : fatal error LNK1120: 1 unresolved externals
执行 link.exe 时出错.

[hen_hao_ji]

void set(int g,double w);

set成员函数，你没实现，就用了

[惬意]

没有定义set

[qq45000]

[Quote=引用 1 楼 的回复:]

void set(int g,double w);

set成员函数，你没实现，就用了
[/Quote]
++

[酱油党]

你查一下，可能其他地方也定义了main
错误提示很明显了

[huangwenshen]

error LNK2005: _main already defined in 4-8 dog 2.obj
在你的工程里面定义了 两个main() 函数
error LNK2001: unresolved external symbol "public: void __thiscall dog::set(int,double)" (?set@dog@@QAEXHN@Z)
成员函数set（）没有实现，只声明了。

[CHENGYAOJUN]

1.main函数重复定义，你的工程里有两个main()函数,如果你使用的visual studio开发工具的话，int _tmain(int argc, _TCHAR* argv[])就是入口函数(也就是main函数);

2.set()没有实现

[zhenglixin360]

set()没有定义，并且"<<jack.getweight<<"少了（）

[qq407824082]

#include<iostream>
using namespace std;
class dog
{
public:
void set(int g,double w){age=g,weight=w;}
dog(int g=0,double w=5);
~dog();
int getage()
{
return age;
}
double getweight()
{
return weight;
}


private:
int age;
double weight;
};

dog::dog(int g,double w)
{ age=g;
weight=w;
}



dog::~dog()
{
}



int main()
{
dog jack(2,10);
cout<<"jack is a dog who is ";
cout<<jack.getage()<<"years old and "<<jack.getweight()<<"pound weight"<<endl;
jack.set(7,20);
cout<<"now jack is ";
cout<<jack.getage()<<"years old and "<<jack.getweight()<<"pound weight"<<endl;

return 0;
}

[demonYJ]

[Quote=引用 6 楼 的回复:]

1.main函数重复定义，你的工程里有两个main()函数,如果你使用的visual studio开发工具的话，int _tmain(int argc, _TCHAR* argv[])就是入口函数(也就是main函数);

2.set()没有实现
[/Quote]
把这个文件单列，编译试试吧。