1
所以，我對操作符重載非常陌生，無法獲取operator-，operator>和operator <的語法。重載operator-，operator <和operator>
我被授予了我的代碼的操作符+代碼，並且我很難將其更改爲操作符函數。我也爲我的運營商<函數獲取了很多錯誤，但不是我的operator>函數，它基本相同。
如果你可以闡明如何做到這一點和/或爲我提供更多幫助的鏈接，那將不勝感激。
這是我到目前爲止有：
（正如你看到的，我只複製和粘貼操作+到我的操作符 - 嘗試和理由吧）
BigInt.cpp
#include <iostream>
#include <string>
#include "BigInt.h"
using namespace std;
BigInt BigInt::operator+(BigInt operand)
{
int carry = 0;
int sum;
BigInt result;
list<int>::reverse_iterator rit1 = number.rbegin();
list<int>::reverse_iterator rit2 = operand.number.rbegin();
while ((rit1 != number.rend()) || (rit2 != operand.number.rend()))
{
sum = 0;
if (rit1 != number.rend())
{
sum += *rit1;
rit1++;
}
if (rit2 != operand.number.rend())
{
sum += *rit2;
rit2++;
}
sum += carry;
result.number.push_front(sum % 10);
carry = sum/10;
}
if (carry > 0)
result.number.push_front(carry);
return result;
}
void BigInt::display(ostream & out)
{
for (list<int>::iterator it = number.begin(); it != number.end(); it++)
{
cout << *it;
}
cout << endl;
}
void BigInt::read(istream & in)
{
string input;
cin >> input;
for (int i = 0; i < input.length(); ++i)
{
int x = input.at(i);
int y = char(x) - char('0');
number.push_back(y);
}
}
bool BigInt::operator<(BigInt operand)
{
list<int>::reverse_iterator rit1 = number.rbegin();
list<int>::reverse_iterator rit2 = operand.number.rbegin();
int count1 = 0, count2 = 0;
bool check;
while ((rit1 != number.rend()) || (rit2 != operand.number.rend()))
{
if (rit1 > rit2)
{
count1++;
rit1++;
rit2++;
}
else if (rit2 > rit1)
{
count2++;
rit1++;
rit2++;
}
else
{
rit1++;
rit2++;
}
}
if(count1 < count2)
{
check = true;
}
else
{
check = false;
}
return check;
}
bool BigInt::operator>(BigInt operand)
{
list<int>::reverse_iterator rit1 = number.rbegin();
list<int>::reverse_iterator rit2 = operand.number.rbegin();
int count1 = 0, count2 = 0;
while ((rit1 != number.rend()) || (rit2 != operand.number.rend()))
{
if (rit1 > rit2)
{
count1++;
rit1++;
rit2++;
}
else if (rit2 > rit1)
{
count2++;
rit1++;
rit2++;
}
else
{
rit1++;
rit2++;
}
}
if(count1 > count2)
{
return true;
}
else
{
return false;
}
}
bool BigInt::operator==(BigInt operand)
{
list<int>::reverse_iterator rit1 = number.rbegin();
list<int>::reverse_iterator rit2 = operand.number.rbegin();
do
{
rit1++;
rit2++;
}
while(rit1 == rit2);
return false;
}
BigInt BigInt::operator-(BigInt operand)
{
int carry = 0;
int sum;
BigInt result;
list<int>::reverse_iterator rit1 = number.rbegin();
list<int>::reverse_iterator rit2 = operand.number.rbegin();
while ((rit1 != number.rend()) || (rit2 != operand.number.rend()))
{
sum = 0;
if (rit1 != number.rend())
{
sum += *rit1;
rit1++;
}
if (rit2 != operand.number.rend())
{
sum += *rit2;
rit2++;
}
sum += carry;
result.number.push_front(sum % 10);
carry = sum/10;
}
if (carry > 0)
result.number.push_front(carry);
return result;
}
BigInt.h
#include <list>
using namespace std;
class BigInt
{
public:
BigInt() {};
void read(istream & in);
void display(ostream & out);
BigInt operator+(BigInt operand); //overloading operator
BigInt operator-(BigInt operand); //subtraction
bool operator<(BigInt operand);
bool operator>(BigInt operand);
bool operator==(BigInt operand);
list<int> number; //using STL list
};
我沒有在我的main.cpp呢。
希望你能幫助我！謝謝！
編輯!!!：
忘記列出我的錯誤，我的操作<功能：
Error 10 error C2676: binary '<' : 'std::_List_iterator<_Mylist>' does not define this operator or a conversion to a type acceptable to the predefined operator c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility 1014
Error 4 error C2784: 'bool std::operator <(const _Elem *,const std::basic_string<_Elem,_Traits,_Alloc> &)' : could not deduce template argument for 'const _Elem *' from 'std::_List_iterator<_Mylist>' c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility 1014
Error 8 error C2784: 'bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'std::_List_iterator<_Mylist>' c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility 1014
Error 3 error C2784: 'bool std::operator <(const std::basic_string<_Elem,_Traits,_Alloc> &,const _Elem *)' : could not deduce template argument for 'const std::basic_string<_Elem,_Traits,_Alloc> &' from 'std::_List_iterator<_Mylist>' c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility 1014
Error 5 error C2784: 'bool std::operator <(const std::basic_string<_Elem,_Traits,_Alloc> &,const std::basic_string<_Elem,_Traits,_Alloc> &)' : could not deduce template argument for 'const std::basic_string<_Elem,_Traits,_Alloc> &' from 'std::_List_iterator<_Mylist>' c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility 1014
Error 2 error C2784: 'bool std::operator <(const std::list<_Ty,_Alloc> &,const std::list<_Ty,_Alloc> &)' : could not deduce template argument for 'const std::list<_Ty,_Alloc> &' from 'std::_List_iterator<_Mylist>' c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility 1014
Error 6 error C2784: 'bool std::operator <(const std::move_iterator<_RanIt> &,const std::move_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::move_iterator<_RanIt> &' from 'std::_List_iterator<_Mylist>' c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility 1014
Error 9 error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'std::_List_iterator<_Mylist>' c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility 1014
Error 7 error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'std::_List_iterator<_Mylist>' c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility 1014
目前尚不清楚問題出在哪裏。如果你知道如何實現'operator +'，那麼實現'operator-'的難度是多少？ –
我會從''while'開始將'||'改爲'&&'。如果這符合我的想法，那麼邏輯運算符在寫入時就不正確。 – WhozCraig
我很困惑如何修改操作員+操作員。運營商和運營商之間是否有很少的修改？ – Midge