C++ C++；使用MinGW的链接器编程错误
我的代码中有一个链接器错误，我无法检测到它。 我认为错误在C++ C++；使用MinGW的链接器编程错误,c++,C++,我的代码中有一个链接器错误，我无法检测到它。 我认为错误在addressBookType类中，但我无法检测到它 main有什么问题吗 或者问题在类定义中 ~z~请帮帮我 Compiler: MinGW GCC 4.6.2 32-bit Executing g++.exe... g++.exe "D:\New Folder\Cpp\Assignment 4\q4\main.cpp" -o "D:\New Folder\Cpp\Assignment 4\q4\main.exe" -I"E:\
addressBookTypemainCompiler: MinGW GCC 4.6.2 32-bit
Executing g++.exe...
g++.exe "D:\New Folder\Cpp\Assignment 4\q4\main.cpp" -o "D:\New Folder\Cpp\Assignment 4\q4\main.exe" -I"E:\Program Files\Dev-Cpp\MinGW32\include" -I"E:\Program Files\Dev-Cpp\MinGW32\include" -L"E:\Program Files\Dev-Cpp\MinGW32\lib" -L"E:\Program Files\Dev-Cpp\MinGW32\lib" -static-libstdc++ -static-libgcc
E:\DOCUME~1\@$L@()V)\LOCALS~1\Temp\ccHC7fsV.o:main.cpp:(.text+0x7a8): undefined reference to `addressBookType::addressBookType()'
E:\DOCUME~1\@$L@()V)\LOCALS~1\Temp\ccHC7fsV.o:main.cpp:(.text+0x7d6): undefined reference to `addressBookType::addressBookType()'
collect2: ld returned 1 exit status
#include<iostream>
#include<cstdlib>
#include<fstream>
#include<string>
using namespace std;
//////////////////////////////"personType" is from D.S Malik Course Website
////////////***Class person Start
class personType
{
public:
void print() const;
//Function to output the first name and last name
//in the form firstName lastName.
void setName(string first, string last);
//Function to set firstName and lastName according
//to the parameters.
//Postcondition: firstName = first; lastName = last
string getFirstName() const;
//Function to return the first name.
//Postcondition: The value of firstName is returned.
string getLastName() const;
//Function to return the last name.
//Postcondition: The value of lastName is returned.
personType(string first, string last);
//Constructor
//Sets firstName and lastName according to the parameters.
//The default values of the parameters are null strings.
//Postcondition: firstName = first; lastName = last
private:
string firstName; //variable to store the first name
string lastName; //variable to store the last name
};
/////////Class person End***///////////
// IMPLEMENTATION OF "PersonType" CLASS //
///////////////// IMP START ////////////////////
personType::personType(string first="",string last=""){
}
void personType::setName(string first,string last){
firstName=first;
lastName=last;
}
string personType::getFirstName() const{
return firstName;
}
string personType::getLastName () const{
return lastName;
}
void personType::print() const{
cout<<firstName<<" "<<lastName<<endl;
}
////////////////// IMP END ////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////
////////***class addressType Start
class addressType{
private:
string stAddress;
string city;
string state;
string zipcode;
public:
addressType();
addressType(string,string,string,string);
void setAddress(string);
string getAddress();
void setCity(string);
string getCity();
void setState(string);
string getState();
void setZipcode(string);
string getZipcode();
};
// IMPLEMENTATION OF "addressType" CLASS //
///////////////// IMP START ////////////////////
addressType::addressType(string=" ",string=" ",string=" ",string=" "){
}
void addressType::setAddress(string addr){
stAddress=addr;
}
string addressType::getAddress(){
return stAddress;
}
void addressType::setCity(string cit){
city=cit;
}
string addressType::getCity(){
return city;
}
void addressType::setState(string sta){
state=sta;
}
string addressType::getState(){
return state;
}
void addressType::setZipcode(string zip){
zipcode=zip;
}
string addressType::getZipcode(){
return zipcode;
}
///////////////// IMP END ////////////////////
//////////class addressType End***
/////////////////////////////////
//////////////////////////////////
//////***class extPersonType Start
class extPersonType {
private:
string relation;
string phNo;
public:
extPersonType();
extPersonType(string,string);
void setRelation(string);
string getRelation();
void setphNo(string);
string getphNo();
};
// IMPLEMENTATION OF "extPersonType" CLASS //
///////////////// IMP START ////////////////////
extPersonType::extPersonType(string =" " ,string = " "){
}
void extPersonType::setRelation(string rel){
relation=rel;
}
string extPersonType::getRelation(){
return relation;
}
void extPersonType::setphNo(string ph){
phNo=ph;
}
string extPersonType::getphNo(){
return phNo;
}
///////////////// IMP END ////////////////////
//////////class extPersonType End***
///////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////"dateType" is from D.S Malik Course Website
////////***class DateType Start
class dateType
{
public:
void setDate(int month, int day, int year);
//Function to set the date.
//The member variables dMonth, dDay, and dYear are set
//according to the parameters.
//Postcondition: dMonth = month; dDay = day;
// dYear = year
int getDay() const;
//Function to return the day.
//Postcondition: The value of dDay is returned.
int getMonth() const;
//Function to return the month.
//Postcondition: The value of dMonth is returned.
int getYear() const;
//Function to return the year.
//Postcondition: The value of dYear is returned.
void printDate() const;
//Function to output the date in the form mm-dd-yyyy.
dateType(int month = 1, int day = 1, int year = 1900);
//Constructor to set the date
//The member variables dMonth, dDay, and dYear are set
//according to the parameters.
//Postcondition: dMonth = month; dDay = day; dYear = year;
// If no values are specified, the default
// values are used to initialize the member
// variables.
private:
int dMonth; //variable to store the month
int dDay; //variable to store the day
int dYear; //variable to store the year
};
//////////class dateType End***
/////////////////////////////////
// IMPLEMENTATION OF "DateType" CLASS //
///////////////// IMP START ////////////////////
void dateType::setDate(int month, int day, int year)
{
dMonth = month;
dDay = day;
dYear = year;
}
int dateType::getDay() const
{
return dDay;
}
int dateType::getMonth() const
{
return dMonth;
}
int dateType::getYear() const
{
return dYear;
}
void dateType::printDate() const
{
cout << dMonth << "-" << dDay << "-" << dYear;
}
//Constructor with parameters
dateType::dateType(int month, int day, int year)
{
dMonth = month;
dDay = day;
dYear = year;
}
//////////////// IMP END /////////////////////
////////////////////////////////////////////////////////////////////////////////
//////***class addressBookType Start
class addressBookType {
private:
string FirstName; //variable to store the first name
string LastName; //variable to store the last name
string StAddress;
string City;
string State;
string Zipcode;
string Relation;
string PhNo;
int DMonth; //variable to store the month
int DDay; //variable to store the day
int DYear; //variable to store the year
protected:
addressType obj1;
dateType obj2;
extPersonType obj3;
public:
addressBookType();
static int count;
void loadData(addressBookType *&ptr);
};
//////////class addressType End***
/////////////////////////////////
// IMPLEMENTATION OF "addressBookType" CLASS //
///////////////// IMP START ////////////////////
void addressBookType::loadData(addressBookType *&ptr){
ifstream fin;
ifstream fout;
string tempName;
cout<<"Enter file name:"<<endl;
if(!fin){
cout<<"Cannot open the image file : "<<endl;
cout<<"Input Failure"<<endl;
system("pause");
}
else{
for(int i=0;!fin.eof();i++){
fin>>FirstName;
fin>>LastName;
fin>>DDay;
fin>>DMonth;
fin>>DYear;
getline(fin,StAddress);
getline(fin,City);
getline(fin,State);
fin>>Zipcode;
fin>>PhNo;
fin>>Relation;
cout<<FirstName<<LastName<<DDay<<DMonth<<DYear<<StAddress<<City<<State<<Zipcode<<PhNo<<Relation<<endl;
}
}
}
int main (){
addressBookType *ptr;
addressBookType obj;
ptr=new addressBookType[500];
obj.loadData(ptr);
system("pause");
return(0);
}
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使用名称空间std；
//////////////////////////////“personType”来自D.S Malik课程网站
////////////***班级人员启动
类人形
{
公众：
无效打印（）常量；
//函数输出名字和姓氏
//格式为firstName lastName。
void setName（首先是字符串，最后是字符串）；
//函数可根据设置firstName和lastName
//对参数进行修改。
//后置条件：firstName=first；lastName=last
字符串getFirstName（）常量；
//函数返回第一个名称。
//Postcondition：返回firstName的值。
字符串getLastName（）常量；
//函数返回姓氏。
//Postcondition：返回lastName的值。
personType（字符串第一，字符串最后）；
//建造师
//根据参数设置firstName和lastName。
//参数的默认值为空字符串。
//后置条件：firstName=first；lastName=last
私人：
string firstName；//用于存储名字的变量
字符串lastName；//用于存储姓氏的变量
};
/////////班长***///////////
//“PersonType”类的实现//
/////////////////IMP启动////////////////////
personType:：personType（字符串第一个=，字符串最后一个=）{
}
void personType:：setName（字符串第一，字符串最后）{
firstName=first；
lastName=last；
}
字符串personType:：getFirstName（）常量{
返回名字；
}
字符串personType:：getLastName（）常量{
返回姓氏；
}
void personType:：print（）常量{
cout很明显，您还没有实现addressBookType
的默认构造函数：
class addressBookType {
//...
addressBookType(); //declare constructor
void loadData(addressBookType *&ptr); //declare method
};
//missing constructor implementation
void addressBookType::loadData(addressBookType *&ptr){ //implement method
//...
}
要解决此错误，只需添加
addressBookType::addressBookType() { }
请注意，这将把字符串成员初始化为空字符串，即对象
addressType obj1;
dateType obj2;
extPersonType obj3;
使用各自的默认构造函数，POD类型将保持未初始化状态。很明显，您尚未实现addressBookType的默认构造函数：
class addressBookType {
//...
addressBookType(); //declare constructor
void loadData(addressBookType *&ptr); //declare method
};
//missing constructor implementation
void addressBookType::loadData(addressBookType *&ptr){ //implement method
//...
}
要解决此错误，只需添加
addressBookType::addressBookType() { }
请注意，这将把字符串成员初始化为空字符串，即对象
addressType obj1;
dateType obj2;
extPersonType obj3;
使用各自的默认构造函数，POD类型将保持未初始化状态