编辑：在底部发布固定代码.谢谢大家的帮助！
我只是在学习c并且在继承方面遇到了麻烦.我已经搜索并搜索并尝试了任何我能做的但是我无法编译这些代码,同时保留了我希望它拥有的功能.
我觉得我犯了一个愚蠢的错误,或者我只是错过了一些重要的概念,但是如果有人能看看它,我真的很感激它！
如果我注释掉StarSystem构造函数中创建对象的3行,那么它就会编译,所以我知道这与问题有关.
#include <iostream>
#include <vector>
#include <string>
#include <stdlib.h>
#include <time.h>
using namespace std;
class SystemBody
{
public:
SystemBody();
int systembodyindex;
int starsystemindex;
SystemBody(int systembodyindex,int starsystemindex)
{
cout << "StarSystem " << starsystemindex << ": creating empty SystemBody " << systembodyindex << endl;
}
};
class Star : public SystemBody
{
public:
Star();
string startype;
Star(int systembodyindex,int starsystemindex)
{
cout << "StarSystem " << starsystemindex << ": converting empty SystemBody into Star " << systembodyindex << endl;
}
};
class Planet : public SystemBody
{
public:
Planet();
string planettype;
Planet(int systembodyindex,int starsystemindex)
{
cout << "StarSystem " << starsystemindex << ": converting empty SystemBody into Planet " << systembodyindex << endl;
}
};
class ExitNode : public SystemBody
{
public:
ExitNode();
vector<int> connectedindexlist;
ExitNode(int systembodyindex,int starsystemindex)
{
cout << "StarSystem " << starsystemindex << ": converting empty SystemBody into Exit Node " << systembodyindex << endl;
}
};
class StarSystem
{
public:
StarSystem();
int starsystemindex;
vector<StarSystem> connectedlist;
vector<Planet> planetlist;
StarSystem(int index)
{
starsystemindex = index;
cout << "--Creating StarSystem: " << starsystemindex << endl;
int numberofbodies = (rand() % 4) + 2;
for ( int i = 0; i < numberofbodies; i +=1 )
{
if ( i == 0 )
{
Star body(i,starsystemindex);
}
else if ( i == numberofbodies )
{
ExitNode body(i,starsystemindex);
}
else
{
Planet body(i,starsystemindex);
}
}
}
void addConnection(StarSystem connectedstarsystem)
{
cout << "--StarSystem " << starsystemindex << ": Adding connection to StarSystem " << connectedstarsystem.starsystemindex << endl;
connectedlist.push_back(connectedstarsystem);
}
};
int main()
{
srand(time(0));
StarSystem starsystem0(0);
return 0;
}
编辑：
感谢大家的帮助！只是在这里发布固定代码,以防将来任何人发现这个有用.
#include <iostream>
#include <vector>
#include <string>
#include <stdlib.h>
#include <time.h>
using namespace std;
class SystemBody
{
public:
int systembodyindex;
int starsystemindex;
SystemBody ( )
{
cout << "----SystemBody BEING CREATED WITH NO PARAMETERS" << endl;
}
SystemBody ( int bodyindex,int systemindex )
{
systembodyindex = bodyindex;
starsystemindex = systemindex;
cout << "----StarSystem " << starsystemindex << ": creating empty SystemBody " << systembodyindex << endl;
}
};
class Star : public SystemBody
{
public:
Star ( int bodyindex,int systemindex ) : SystemBody ( bodyindex,systemindex )
{
cout << "----StarSystem " << starsystemindex << ": converting empty SystemBody into Star " << systembodyindex << endl;
}
};
class Planet : public SystemBody
{
public:
Planet ( int bodyindex,systemindex )
{
cout << "----StarSystem " << starsystemindex << ": converting empty SystemBody into Planet " << systembodyindex << endl;
}
};
class ExitNode : public SystemBody
{
public:
ExitNode ( int bodyindex,systemindex )
{
cout << "----StarSystem " << starsystemindex << ": converting empty SystemBody into ExitNode " << systembodyindex << endl;
}
};
class StarSystem
{
public:
int starsystemindex;
vector<StarSystem> connectedlist;
vector<Planet> planetlist;
StarSystem ( int index )
{
starsystemindex = index;
cout << "--Creating StarSystem: " << starsystemindex << endl;
int numberofbodies = (rand() % 4 ) + 2;
for ( int i = 0; i <= numberofbodies; i +=1 )
{
if ( i == 0)
{
Star body(i,starsystemindex);
}
else if ( i == numberofbodies )
{
ExitNode body(i,starsystemindex);
}
else
{
Planet body(i,starsystemindex);
}
}
}
};
int main()
{
srand(time(0));
StarSystem starsystem0(0);
return 0;
}
解决方法
也许这只是我,但你的构造函数是一个简单的declration,没有定义：
class StarSystem
{
public:
StarSystem(); // <--- Undefined!
您已声明了构造函数,但是没有定义此构造函数中实际发生的内容.
如果它是一个什么也不做的构造函数,那就做吧
StarSystem () {} // Defined.
// Nothing happens inside,but everything gets default-constructed!
作为旁注,当发布这些类型的东西时,它有助于发布错误号并发表评论或某种指示错误发生的位置(因此我们可以在您的巨大代码中看到它).
