函数重载问题,C\C++交流,技术交流,鱼C论坛

943566987 发表于 2014-11-13 22:40:26

函数重载问题

在看完小甲鱼的C++函数重载后自己下载代码编了一下为什么会报错我发现那源代码也是一样的错误为什么会这样？
struct FishOil
{
std::string name;
std::string uid;
char sex;
};
bool InitFishC();
bool ReadFishC();
void RecordFishC();
bool WriteFishC(FishOil *OilData);
int main()
{
int i;
InitFishC();
while(1)
{
std::cout<<"请选择需要进行的操作: \n";
std::cout<<"1. 打印数据到屏幕\n";
std::cout<<"2. 录入数据\n";
std::cout<<"3. 退出程序\n";
std::cin>>i;
switch(i)
{
case 1:
if(ReadFishC())
std::cout<<"成功读取文件：";
else
std::cout<<"读取文件失败：";
break;
case 2:
RecordFishC();
break;
case 3:
return 0;
}
}
std::cout<<"初始化失败T_T......\n\n";
return 0;
}
bool InitFishC()
{
FishOil OilInit = {"小甲鱼", "fishc00001", 'M'};
if(WriteFishC(&OilInit) == false)
std::cout << "初始化失败T_T\n";
}
bool ReadFishC()
{
std::string temp;
std::ifstream fileInput("FishC.txt");
if(fileInput.is_open ())
{
std::cout<<"\n正在输出记录数据...... ";
for( int i =0; i<=100; i++)
{
std::cout.width(3);
std::cout << i << "%";
std::cout<<"\b\b\b\b";
}
std::cout <<"\n\n";
std::cout<<" 姓名 " << "身份证" << " 性别 " << "\n\n";
while (std::getline(fileInput.temp))
{
std::cout << temp << " ";
std::cout << "\n";
}
std::cout <<"\n\n";
return true;
}
else
return false;
}
void RecordFishC()
{
char goon,Save;
FishOil OilData;
FishOil *pOilData;
goon ='Y';
while ('Y' ==goon)
{
std::cout << "请输入鱼C账号: ";
std::cin >> OilData.name;
std::cout<<"请输入鱼C身份证：";
std::cin >> OilData.uid;
std::cout <<"请输入性别：";
std::cin >> OilData.sex;
std::cout <<"录入成功, 请问需要保存吗？（Y/N）";
std::cin >>Save;
if( 'Y' ==Save)
{
pOilData = &OilData;
if(WriteFishC(pOilData))
std::cout<< "成功写入文件^_^\n";
else
std::cout << "写入文件失败T_T\n";
}
else
{
return ;
}
std::cout<<"/n请问需要再次录入吗？（Y/N）";
std::cin >>goon;
}
}
bool WriteFishC(FishOil *pOilData)
{
std::ofstream fileOutput("FishC.txt", std::ios::app);

if(fileOutput.is_open ())
{
fileOutput << pOilData->name << " ";
fileOutput << pOilData->uid << " ";
fileOutput << pOilData->sex << "\n";
fileOutput.close ();
std::cout << "数据成功保存到FishC.txt\n\n";
}
else
std::cout <<"保存失败T_T\n";
}error C2552: 'OilInit' : non-aggregates cannot be initialized with initializer list
d:\代码\练习\函数重载5\1.cpp(77) : error C2039: 'getline' : is not a member of 'std'
d:\代码\练习\函数重载5\1.cpp(77) : error C2065: 'getline' : undeclared identifier
d:\代码\练习\函数重载5\1.cpp(77) : error C2039: 'temp' : is not a member of 'basic_ifstream<char,struct std::char_traits<char> >'
d:\代码\练习\函数重载5\1.cpp(79) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversio
n)
d:\代码\练习\函数重载5\1.cpp(100) : error C2679: binary '>>' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversi
on)
d:\代码\练习\函数重载5\1.cpp(102) : error C2679: binary '>>' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversi
on)
d:\代码\练习\函数重载5\1.cpp(132) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversi
on)
d:\代码\练习\函数重载5\1.cpp(133) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' (or there is no acceptable conversi
on)
Error executing cl.exe.

仰望天上的光 发表于 2014-11-14 10:33:57

FishOil OilInit = {"小甲鱼", "fishc00001", 'M'};这个写法是不对的，因为此结构体中含有string类型的成员变量，不能用C的结构体初始化方式进行初始化

路飞~小强 发表于 2014-11-14 21:39:56

加上using namespace std

943566987 发表于 2014-11-14 23:04:13

仰望天上的光发表于 2014-11-14 10:33
FishOil OilInit = {"小甲鱼", "fishc00001", 'M'};这个写法是不对的，因为此结构体中含有string类型的成员 ...

这代码是我在论坛上下载的那为什么小甲鱼就能在编译器上正常运行呢？

943566987 发表于 2014-11-14 23:10:25

路飞~小强发表于 2014-11-14 21:39
加上using namespace std

为什么我把 using namespace std加上后会在structFishOil语句就报错
我把这个语句移到bool WriteFishC(FishOil *OilDat;a);语句下面 structFishOil函数不报错了而是bool InitFishC(); 报错我想问问这是为什么？

路飞~小强 发表于 2014-11-15 20:37:48

你这个写法不是重载啊，只有类的成员函数才能重载，你这样写，是普通的全局函数而已

943566987 发表于 2014-11-15 22:30:30

路飞~小强发表于 2014-11-15 20:37
你这个写法不是重载啊，只有类的成员函数才能重载，你这样写，是普通的全局函数而已

不知道这是编译器的问题还是什么原因在论坛上下载了代码也是出现这样的问题
我在百度上查了一下说是头文件定义错了你知道是什么问题造成的吗？

这是struct FishOil函数提示的错误
error C2143: syntax error : missing ';' before '<class-head>'
fatal error C1004: unexpected end of file found

我把struct FishOil函数发在bool WriteFishC(FishOil *OilData);函数下面时的错误
syntax error : missing ';' before identifier 'bool'
fatal error C1004: unexpected end of file found

路飞~小强 发表于 2014-11-17 19:29:17

unexpected end of file end 一般是｛｝不匹配，你自己好好看看程序

lyb_stamina 发表于 2015-11-25 18:00:57

仔细看，编译通过，运行正常：
#include <iostream>
#include <fstream>
#include <windows.h> // 为了使用Sleep()函数
#include <STRING>
struct FishOil
{
std::string name;
std::string uid;
char sex;
}OilInit;

InitFishC();
bool ReadFishC();
void RecordFishC();
bool WriteFishC(FishOil *OilData);

int main()
{
int i;

InitFishC();// 初始化数据。
while( 1 )
{
std::cout << "请选择需要进行的操作: \n";
std::cout << "1. 打印数据到屏幕\n";
std::cout << "2. 录入数据\n";
std::cout << "3. 退出程序\n";
std::cin >> i;

switch( i )
{
case 1:
if( ReadFishC() )
std::cout << "成功读取文件^_^\n\n";
else
std::cout << "读取文件失败T_T\n\n";
break;
case 2:
RecordFishC();
break;
case 3:
return 0;
}
}

std::cout << "初始化失败T_T......\n\n";

return 0;

}
InitFishC()
{
//OilInit={"小甲鱼", "fishc00001", 'M'};
OilInit.name = "lyb";
OilInit.uid = "23";
OilInit.sex = 'm';

if( WriteFishC(&OilInit) == false ){
std::cout << "初始化失败T_T\n";
}
}

bool ReadFishC()
{
std::string temp;
std::ifstream fileInput("FishC.txt");

if( fileInput.is_open() )
{
std::cout << "\n正在输出记录数据...... ";
for( int i=0; i <= 100; i++ ) // 打印百分比
{
std::cout.width(4);
std::cout << i << "%";
Sleep(50);
std::cout << "\b\b\b\b\b";
}
std::cout << "\n\n";

std::cout << " 姓名 " << "身份证" << " 性别 " << "\n\n";

while( std::getline( fileInput, temp ) )
{
std::cout << temp << " ";
std::cout << "\n";
}
std::cout << "\n\n";

return true;
}
else
return false;
}

void RecordFishC()
{
char goon, Save;
FishOil OilData;
FishOil *pOilData;

goon = 'Y';
while( 'Y' == goon )
{
std::cout << "请输入鱼C账号: ";
std::cin >> OilData.name;
std::cout << "请输入鱼C身份证：";
std::cin >> OilData.uid;
std::cout << "请输入性别：";
std::cin >> OilData.sex;

std::cout << "录入成功, 请问需要保存吗？（Y/N）";
std::cin >> Save;
if( ('y'|'Y') == Save )
{
pOilData = &OilData;
if( WriteFishC( pOilData ) )
std::cout << "成功写入文件^_^\n";
else
std::cout << "写入文件失败T_T\n";
}
else
{
return;
}

std::cout << "/n请问需要再次录入吗？（Y/N）";
std::cin >> goon;
}
}

bool WriteFishC( FishOil *pOilData )
{
std::ofstream fileOutput("FishC.txt", std::ios::app);
// std::ios::app用来说明在老数据追加新数据
if( fileOutput.is_open() )
{
fileOutput << pOilData->name << " ";
fileOutput << pOilData->uid << " ";
fileOutput << pOilData->sex << "\n";

fileOutput.close();
std::cout << "数据成功保存到FishC.txt\n\n";
return true;

}
else
{
std::cout << "保存失败T_T\n";
return false;
}

}

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函数重载问题