请问包含结构指针的结构体怎么初始化?

2008-03-24 11:41:54 560 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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struct Base
{
int a;
int b;
int c;
};

struct Derived
{
int d;
int e;
int f;
base *pb;
};

derived *CreateDerived (void){}
void FreeDerived (derived *pd){}
要求完成这两个函数,并可以使用如下的语句,
Derived *p = CreateDerived();
p->pb->a = 10;

...全文

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snoopy84

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切换为时间正序

laolaoliu2002 2008-03-24

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5楼写的很标准

ryfdizuo 2008-03-24

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[Quote=引用 4 楼 akirya 的回复:]
C/C++ code

Derived * CreateDerived()
{
Derived *p = (Derived *)malloc( sizeof(Derived) );
p->pb = (Base*)malloc(sizeof(Base));
return p;
}

void FreeDerived(Derived *p)
{
free( p->pb);
free(p);
}
[/Quote]

太乙 2008-03-24

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Derived *CreateDerived (void)

{

   return malloc(sizeof(struct Derived));



} 

void FreeDerived (Derived *pd)

{

   if(pd==null)return;

   if(pd->pb!=null)free(pd->pb);

   free(pd);

}

Supper_Jerry 2008-03-24

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#include  <iostream> 

using namespace std; 

struct Base 

{ 

	int a; 

	int b; 

	int c; 

}; 



struct Derived 

{ 

	int d; 

	int e; 

	int f; 

	Base *pb; 

}; 

Derived *CreateDerived (void)

{

	Derived* pD = (Derived*)malloc(sizeof(Derived));

	if(pD)

	{

		pD->pb = (Base*)malloc(sizeof(Base));

		return pD;

	}

	return NULL;

} 

void FreeDerived (Derived *pd)

{

	if(pd)

	{

		if(pd->pb)

		{

			free(pd->pb);

			pd->pb = NULL;

		}

		free(pd);

		pd = NULL;

	}

}



int main(int argc, char* argv[]) 

{

	Derived *p = CreateDerived(); 

	p->pb->a = 10;

	FreeDerived(p);

	return 0; 

}

使用malloc free

珍惜生命远离CPP 2008-03-24

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Derived * CreateDerived()

{

  Derived *p = (Derived *)malloc( sizeof(Derived) );

  p->pb = (Base*)malloc(sizeof(Base));

  return p;

}



void FreeDerived(Derived *p)

{

  free( p->pb);

  free(p);

}

Supper_Jerry 2008-03-24

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#include  <iostream> 

using namespace std; 

struct Base 

{ 

	int a; 

	int b; 

	int c; 

}; 



struct Derived 

{ 

	int d; 

	int e; 

	int f; 

	Base *pb; 

}; 

Derived *CreateDerived (void)

{

	Derived* pD = new Derived;

	if(pD)

	{

		pD->pb = new Base;

		return pD;

	}

	return NULL;

} 

void FreeDerived (Derived *pd)

{

	if(pd)

	{

		if(pd->pb)

		{

			delete pd->pb;

			pd->pb = NULL;

		}

		delete pd;

		pd = NULL;

	}

}



int main(int argc, char* argv[]) 

{

	Derived *p = CreateDerived(); 

	p->pb->a = 10;

	FreeDerived(p);

	return 0; 

}

珍惜生命远离CPP 2008-03-24

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Derived * CreateDerived()

{

  Derived *p = new Derived;

  p->pb = new Base;

  return p;

}



void FreeDerived(Derived *p)

{

  delete p->pb;

  delete p;

}

snoopy84 2008-03-24

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要求用malloc

snoopy84 2008-03-24

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不好意思,各位大侠都应当给分的,下次下次,请别见怪,第一次问问题,呵呵

「已注销」 2008-03-24

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在C++中,struct被当成class来编译的,所以也可以写成下面这样,增加构造函数和析构函数:



#include  <iostream> 

using namespace std; 

struct Base 

{ 

    int a; 

    int b; 

    int c; 

}; 



struct Derived 

{ 

    int d; 

    int e; 

    int f; 

    Base *pb; 

    Derived(){

       pb = new Base;

    }

    ~Derived(){

       delete pb; 

    }

}; 



int main(int argc, char* argv[]) 

{

    Derived *p = new Derived();

    p->pb->a = 10;

    delete p;

    return 0; 

}

snoopy84 2008-03-24

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谢谢各位大侠,我结贴了

请问包含结构指针的结构体怎么初始化?

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