c++ - 类变量无法正常工作，因为我想要重载 operator=
问题描述
也许我遗漏了一些东西，但由于某种原因，重载operator=可以成功地使用Fuel变量但不能使用Capacity，即使它们具有完全相同的属性。
class CGasStation
{
private:
int Capacity[4];
int Fuel[4];
int PistolSize;
public:
CGasStation(int StartingFuel = 100, int StartingCapacity = 200, int StartingPistolSize = 10);
virtual ~CGasStation();
void SetCapacity(int NewCapacity, int StorageNum);
void SetPistolSize(int);
void AddFuel(int, int StorageNum);
float FuelUpCar(float, int StorageNum);
void FixFuel();
void FixCapacity();
void GetInfo(int StorageNum);
/*__________________________________________________________________________________________________________________________________________________________________*/
CGasStation& operator= (const CGasStation & NewSize);
/*__________________________________________________________________________________________________________________________________________________________________*/
CGasStation& operator= (const CGasStation & NewSize);
#include "GasStation.h"
#include <iostream>
using namespace std;
CGasStation::CGasStation(int StartingFuel, int StartingCapacity, int StartingPistolSize)
{
for (int i = 0; i < 4; i++)
{
Capacity[i] = StartingCapacity;
Fuel[i] = StartingFuel;
}
PistolSize = StartingPistolSize;
}
void CGasStation::FixFuel()
{
for (int i = 0; i < 4; i++)
{
if (Fuel[i] > Capacity[i])
{
Fuel[i] = Capacity[i];
}
}
}
void CGasStation::FixCapacity()
{
for (int i = 0; i < 4; i++)
{
if (Capacity[i] < 50)
{
Capacity[i] = 50;
}
}
}
CGasStation::~CGasStation()
{
}
void CGasStation::GetInfo(int StorageNum)
{
cout << "Capacity: " << Capacity[StorageNum] << endl << "Fuel: " << Fuel[StorageNum] << endl << "Pistol Size: " << PistolSize << endl << "________________________________________________________________________________________________________________________" << endl;
}
void CGasStation::SetCapacity(int NewCapacity, int StorageNum)
{
Capacity[StorageNum] = NewCapacity;
if (Capacity[StorageNum] < 50)
{
Capacity[StorageNum] = 50;
}
}
void CGasStation::SetPistolSize(int NewPistolSize)
{
PistolSize = NewPistolSize;
if (PistolSize < 10)
{
PistolSize = 10;
}
if (PistolSize > 300)
{
PistolSize = 300;
}
}
void CGasStation::AddFuel(int AdditionalFuel, int StorageNum)
{
if (AdditionalFuel < 0)
{
AdditionalFuel = 0;
}
Fuel[StorageNum] = Fuel[StorageNum] + AdditionalFuel;
}
float CGasStation::FuelUpCar(float SoldFuel, int StorageNum)
{
if (SoldFuel < 0)
{
SoldFuel = 0;
}
if (SoldFuel > Fuel[StorageNum])
{
SoldFuel = Fuel[StorageNum];
}
Fuel[StorageNum] -= SoldFuel;
return (SoldFuel / PistolSize);
}
/*__________________________________________________________________________________________________________________________________________________________________*/
CGasStation& CGasStation::operator= (const CGasStation& NewSize)
{
for (int i = 0; i < 4; i++)
{
Capacity[i] = NewSize.Capacity[i];
Fuel[i] = NewSize.Fuel[i];
}
return *this;
}
#include <iostream>
#include "GasStation.h"
using namespace std;
int main()
{
CGasStation GasStation;
int choise, StorageNum, a, b;
while (true)
{
cout << "Menu:" << endl << "1-Get information" << endl << "2-Change capacity" << endl << "3-Change pistol size" << endl << "4-Add fuel to the storage" << endl << "5-Fuel up a car" << endl << "6-Exit" << endl << "7-Set new capacity and fuel amount for all storages" << endl << "8-increase cacity and fuel amount for all storages" << endl << endl;
cin >> choise;
cout << "________________________________________________________________________________________________________________________" << endl;
if (choise != 1 && choise != 2 && choise != 3 && choise != 4 && choise != 5 && choise != 6 && choise != 7 && choise != 8)
{
cout << "Pomilka";
break;
}
if (choise == 1)
{
cout << "Which storage would you like to check?(1-4)" << endl;
cin >> StorageNum;
cout << endl;
if (StorageNum != 1 && StorageNum != 2 && StorageNum != 3 && StorageNum != 4)
{
cout << "Pomilka";
break;
}
else
{
GasStation.GetInfo(StorageNum - 1);
}
}
if (choise == 2)
{
cout << "Which storage would you like to change in size?(1-4)" << endl;
cin >> StorageNum;
cout << endl;
if (StorageNum != 1 && StorageNum != 2 && StorageNum != 3 && StorageNum != 4)
{
cout << "Pomilka";
break;
}
else
{
cout << "Insert new size value (cannot be less than 50)" << endl;
cin >> a;
cout << endl << "________________________________________________________________________________________________________________________" << endl;
GasStation.SetCapacity(a, StorageNum - 1);
GasStation.FixFuel();
}
}
if (choise == 3)
{
cout << "Insert new pistol size value (10<your size<300)" << endl;
cin >> a;
cout << endl << "________________________________________________________________________________________________________________________" << endl;
GasStation.SetPistolSize(a);
}
if (choise == 4)
{
cout << "Which storage would you like to fill up?(1-4)" << endl;
cin >> StorageNum;
cout << endl;
if (StorageNum != 1 && StorageNum != 2 && StorageNum != 3 && StorageNum != 4)
{
cout << "Pomilka";
break;
}
else
{
cout << "How much fuel would you like to add?" << endl;
cin >> a;
cout << endl << "________________________________________________________________________________________________________________________" << endl;
GasStation.AddFuel(a, StorageNum - 1);
GasStation.FixFuel();
}
}
if (choise == 5)
{
cout << "Which storage would you like to use for filling?(1-4)" << endl;
cin >> StorageNum;
cout << endl;
if (StorageNum != 1 && StorageNum != 2 && StorageNum != 3 && StorageNum != 4)
{
cout << "Pomilka";
break;
}
else
{
cout << "How much would you like to use up?" << endl;
cin >> a;
cout << endl;
cout << "Time to fill up a car: " << GasStation.FuelUpCar(a, StorageNum - 1) << " minutes" << endl << "________________________________________________________________________________________________________________________" << endl;
}
}
if (choise == 6)
{
break;
if (choise == 7)
{
cout << "What capacity and fuel amount would you like to set?" << endl << endl;
cin >> b;
GasStation = b;
GasStation.FixCapacity();
GasStation.FixFuel();
cout << "________________________________________________________________________________________________________________________" << endl;
}
}
return 0;
}
更改为显示整个程序，因为这是一个大学项目，需要我使用以前的项目，所以之前制作的所有内容都必须保持原样，我唯一可以更改的部分是重载。是的，我必须超载它，我不能说没有它就可以了。
这是结果的截图：
起始金额为Capacity200，起始金额为Fuel100。在截图中，Fuel按照程序的意图进行了更改，它只是FixFuel确保它不会超过限制，但Capacity根本没有改变，我不知道为什么。
我不知道出了什么问题，这是我在这个网站上的第一个问题，所以我希望你们中的一些人能帮助我。
这是同一问题的一个非常简短的版本：
class Testing
{
private:
int a[4];
int b[4];
public:
Testing(int startingA = 100, int startingB = 200);
void GetInfo(int Number);
/*__________________________________________________*/
Testing& operator= (const Testing& NewNum);
};
#include "Testing.h"
#include <iostream>
using namespace std;
Testing::Testing(int startingA, int startingB)
{
for (int i = 0; i < 4; i++)
{
a[i] = startingA;
b[i] = startingB;
}
}
void Testing::GetInfo(int Number)
{
cout << "a: " << a[Number] << endl << "b: " << b[Number] << endl << endl;
}
Testing& Testing::operator= (const Testing& NewNum)
{
for (int i = 0; i < 4; i++)
{
a[i] = NewNum.a[i];
b[i] = NewNum.b[i];
}
return *this;
}
#include <iostream>
#include "Testing.h"
using namespace std;
int main()
{
Testing Test;
int choise, Number, NewNum;
while (true)
{
cout << "Menu:" << endl << "1-Get info" << endl << "2-Change info" << endl << "3-exit" << endl << endl;
cin >> choise;
if (choise != 1 && choise != 2 && choise != 3)
{
cout << "error";
break;
}
if (choise == 1)
{
cout << endl << "Which number would you like to check?(1-4)" << endl << endl;
cin >> Number;
cout << endl;
if (Number != 1 && Number != 2 && Number != 3 && Number != 4)
{
cout << "error";
break;
}
else
{
Test.GetInfo(Number - 1);
}
}
if (choise == 2)
{
cout << endl << "Imput new number" << endl << endl;
cin >> NewNum;
Test = NewNum;
cout << endl;
}
if (choise == 3)
{
break;
}
}
return 0;
}
问题是，为什么价值a会改变，而价值b不会？我该如何解决？
解决方案
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