创建对象错误 - 编程论坛

#2

coachard2007-09-27 22:31

可不可以把这个类贴出来看看？？

#3

魔城侠客2007-09-28 11:12

回复：（魔城侠客）创建对象错误

#include"school.h"
#ifndef PERSON_H
#define PERSON_H
class person
{
private:
char *id;
char *name;
float score[3];
school sch;
public:
person(char *,char *,float,float,float);
person(const person &init);
person &operator=(const person &right);
~person();
void modify(char *,char *,char *);
void display();
};
#endif

#include<iostream.h>
#include<string.h>
#include"school.h"
#include"Person.h"
person::person(char *i="00000",char *n="vigour",float s0=0,float s1=0,float s2=0)
{
id=new char[strlen(i)+1];
name=new char[strlen(n)+1];
strcpy(id,i);
strcpy(name,n);
score[0]=s0;
score[1]=s1;
score[2]=s2;
}
person::person(const person &init)
{
//delete []name;
//delete []id;
name=new char[strlen(init.name)+1];
id=new char[strlen(init.id)+1];
strcpy(name,init.name);
strcpy(id,init.id);
score[0]=init.score[0];
score[1]=init.score[1];
score[2]=init.score[2];
}
/*person &person::operator =(const person &right)
{
if(&right!=this)
{
delete []name;
delete []id;
name=new char[strlen(right.name)+1];
id=new char[strlen(right.id)+1];
strcpy(name,right.name);
strcpy(id,right.id);
}
return *this;
}*/
void person::modify(char *n,char *c,char *s)
{
delete []name;
name=new char[strlen(n)+1];
strcpy(name,n);
sch.modify(c,s);
}
void person::display()
{
cout<<"学号:"<<id<<endl
<<"姓名:"<<name<<endl
<<"成绩:"<<score[0]<<","
<<score[1]<<","<<score[2]<<endl;
sch.display();
}
person::~person()
{
delete []id;
delete []name;
//delete []score;
}

#4

魔城侠客2007-09-28 11:13

就这样，在定义person类的对象时，创建一个不带参数的对象就提示出错

#5

coachard2007-09-28 12:07

#include<iostream>
#include<string.h>
using namespace std;
class person
{
private:
char *id;
char *name;
float score[3];
public:
person(char *i="00000",char *n="vigour",float s0=0,float s1=1,float s2=2);
person(const person &init);
void show(void); //这个没用,我测试用
~person();
};

void person::show(void) //这个我测试用
{
cout<<this->score[1]<<endl;
return;
}
person::person(char *i,char *n,float s0,float s1,float s2)
{
id=new char[strlen(i)+1];
name=new char[strlen(n)+1];
strcpy(id,i);
strcpy(name,n);
score[0]=s0;
score[1]=s1;
score[2]=s2;
}
person::person(const person &init)
{
//delete []name;
//delete []id;
name=new char[strlen(init.name)+1];
id=new char[strlen(init.id)+1];
strcpy(name,init.name);
strcpy(id,init.id);
score[0]=init.score[0];
score[1]=init.score[1];
score[2]=init.score[2];
}
/*person &person::operator =(const person &right)
{
if(&right!=this)
{
delete []name;
delete []id;
name=new char[strlen(right.name)+1];
id=new char[strlen(right.id)+1];
strcpy(name,right.name);
strcpy(id,right.id);
}
return *this;
}*/

person::~person()
{
delete []id;
delete []name;
//delete []score;
}
int main(void) //我测试用
{
person onePerson;
onePerson.show();
person s1("0505005440","city",80,86,87);
s1.show();
system("pause");
return 0;
}

改成这样，你看看。。。

[此贴子已经被作者于2007-9-28 12:08:42编辑过]

#6

魔城侠客2007-09-28 12:15

我知道哪里错了
#include"school.h"
#ifndef PERSON_H
#define PERSON_H
class person
{
private:
char *id;
char *name;
float score[3];
school sch;
public:
person(char *,char *,float,float,float); //这里带上初值就行了，其它地方不用改
person(const person &init);
~person();
void modify(char *,char *,char *);
void display();
};
#endif

#7

coachard2007-09-28 14:48

这个~~~~~~，默认变元只在声明段中，不用放在函数定义时。。。

#8

魔城侠客2007-09-28 15:36

如果想定义带缺省参数的构造函数，那么一定要在定义时就带上初值
不然就会被认为是一般的带参数的构造函数
在创建对象时，调用构造函数时没有参数，所以会提示出错，我已经试过了
呵呵
person(char *i="0000",char *n="0000",float =0,float =0,float=0);
定义时就这样
你可以试下

#9

coachard2007-09-28 15:46

不会啊，我试过了。。。

你用什么编译器？？？

#10

魔城侠客2007-09-29 15:37

ＶＣ啊

#11

魔城侠客2007-09-29 15:37

public:
person(char *i="00000",char *n="vigour",float s0=0,float s1=1,float s2=2);
person(const person &init);
void show(void); //这个没用,我测试用
~person();
};
你在定义时也带上了初值，而我的是没带的