我相信我的所有代码都是正确的，但如果您发现任何错误，请告诉我。我收到了这个链接错误。
该程序操纵分数并测试重载方法。 感谢任何有助于提前帮助的人。
1>------ Build started: Project: hw05, Configuration: Debug Win32 ------
1> main.cpp
1>main.obj : error LNK2005: "public: __thiscall Fraction::Fraction(int,int)" (??0Fraction@@QAE@HH@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "class std::basic_istream<char,struct std::char_traits<char> > & __cdecl operator>>(class std::basic_istream<char,struct std::char_traits<char> > &,class Fraction &)" (??5@YAAAV?$basic_istream@DU?$char_traits@D@std@@@std@@AAV01@AAVFraction@@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,class Fraction const &)" (??6@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AAV01@ABVFraction@@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: bool __thiscall Fraction::operator==(class Fraction const &)const " (??8Fraction@@QBE_NABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: bool __thiscall Fraction::operator!=(class Fraction const &)const " (??9Fraction@@QBE_NABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: class Fraction __thiscall Fraction::operator*(class Fraction const &)const " (??DFraction@@QBE?AV0@ABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: class Fraction __thiscall Fraction::operator-(class Fraction const &)const " (??GFraction@@QBE?AV0@ABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: class Fraction __thiscall Fraction::operator+(class Fraction const &)const " (??HFraction@@QBE?AV0@ABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: class Fraction __thiscall Fraction::operator/(class Fraction const &)const " (??KFraction@@QBE?AV0@ABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: bool __thiscall Fraction::operator<(class Fraction const &)const " (??MFraction@@QBE_NABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: bool __thiscall Fraction::operator<=(class Fraction const &)const " (??NFraction@@QBE_NABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: bool __thiscall Fraction::operator>(class Fraction const &)const " (??OFraction@@QBE_NABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: bool __thiscall Fraction::operator>=(class Fraction const &)const " (??PFraction@@QBE_NABV0@@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: int __thiscall Fraction::getDenominator(void)const " (?getDenominator@Fraction@@QBEHXZ) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: int __thiscall Fraction::getNumerator(void)const " (?getNumerator@Fraction@@QBEHXZ) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: void __thiscall Fraction::reduce(void)" (?reduce@Fraction@@QAEXXZ) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: double __thiscall Fraction::returnDecimal(void)const " (?returnDecimal@Fraction@@QBENXZ) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: void __thiscall Fraction::setDenominator(int)" (?setDenominator@Fraction@@QAEXH@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: void __thiscall Fraction::setNumerator(int)" (?setNumerator@Fraction@@QAEXH@Z) already defined in Fraction.obj
1>main.obj : error LNK2005: "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall Fraction::toString(void)const " (?toString@Fraction@@QBE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) already defined in Fraction.obj
1>Fraction.obj : error LNK2019: unresolved external symbol "private: int __thiscall Fraction::gcd(void)const " (?gcd@Fraction@@ABEHXZ) referenced in function "public: void __thiscall Fraction::reduce(void)" (?reduce@Fraction@@QAEXXZ)
1>main.obj : error LNK2001: unresolved external symbol "private: int __thiscall Fraction::gcd(void)const " (?gcd@Fraction@@ABEHXZ)
1>C:\Users\Matt\Documents\SIUE COMPUTER SCIENCE\CS 240 Projects\ConsoleApplication2\Debug\hw05.exe : fatal error LNK1120: 1 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
这是我的课程。
的main.cpp
#include <iostream>
#include "Fraction.h"
#include "string"
using namespace std;
int main()
{
Fraction temp;
Fraction tempTwo;
Fraction tempThree;
cout << "Please enter the first fraction. [numerator denominator]: ";
cin >> temp;
cout << "You entered: " << temp << endl << endl;
cout << "Please enter the second fraction. [numerator denominator]: ";
cin >> tempTwo;
cout << "You entered: " << tempTwo << endl << endl;
cout << "f1 = " << temp << ", f2 = " << tempTwo << endl;
tempThree = (temp + tempTwo);
cout << "f1 + f2 = " << tempThree << " = ";
tempThree.reduce();
cout << tempThree << " = " << tempThree.returnDecimal() << endl;
tempThree = (temp - tempTwo);
cout << "f1 - f2 = " << tempThree << " = ";
tempThree.reduce();
cout << tempThree << " = " << tempThree.returnDecimal() << endl;
tempThree = (temp * tempTwo);
cout << "f1 * f2 = " << tempThree << " = ";
tempThree.reduce();
cout << tempThree << " = " << tempThree.returnDecimal() << endl;
tempThree = (temp / tempTwo);
cout << "f1 / f2 = " << tempThree << " = ";
tempThree.reduce();
cout << tempThree << " = " << tempThree.returnDecimal() << endl << endl;
return 0;
}
Fraction.cpp
#include "Fraction.h"
#include <iostream>
using namespace std;
Fraction::Fraction(const int numerator, const int denominator) { }
int Fraction::getNumerator() const {
return numerator;
}
int Fraction::getDenominator() const {
return denominator;
}
void Fraction::setNumerator(const int numerator) {
this->numerator = numerator;
}
void Fraction::setDenominator(const int denominator) {
this->denominator = denominator;
}
string Fraction::toString() const {
return "";
}
int Fraction::gcd() const {
int n = numerator;
int d = denominator;
int tmp;
while (d != 0) {
tmp = n % d;
n = d;
d = tmp;
}
return n;
}// end gcd()
double Fraction::returnDecimal() const {
double a = (double) getNumerator();
double b = (double) getDenominator();
return (a / b);
}
void Fraction::reduce() {
int a = gcd();
int b = numerator / a;
int c = denominator / a;
setNumerator(b);
setDenominator(c);
}
Fraction Fraction::operator +(const Fraction& f) const {
Fraction temp;
int a = getNumerator();
int b = getDenominator();
int c = f.getNumerator();
int d = f.getDenominator();
int tempOne = b;
int tempTwo = d;
a = a * tempTwo;
b = b * tempTwo;
c = c * tempOne;
d = d * tempOne;
temp.setNumerator(a+c);
temp.setDenominator(d);
return temp;
}
Fraction Fraction::operator -(const Fraction& f) const {
Fraction temp;
int a = getNumerator();
int b = getDenominator();
int c = f.getNumerator();
int d = f.getDenominator();
int tempOne = b;
int tempTwo = d;
a = a * tempTwo;
b = b * tempTwo;
c = c * tempOne;
d = d * tempOne;
temp.setNumerator(a-c);
temp.setDenominator(d);
return temp;
}
Fraction Fraction::operator *(const Fraction& f) const {
Fraction temp;
temp.setNumerator(getNumerator() * f.getNumerator());
temp.setDenominator(getDenominator() * f.getDenominator());
return temp;
}
Fraction Fraction::operator /(const Fraction& f) const {
Fraction temp;
temp.setNumerator(getNumerator() * f.getDenominator());
temp.setDenominator(getDenominator() * f.getNumerator());
return temp;
}
bool Fraction::operator ==(const Fraction& f) const {
return ( (getNumerator() == f.getNumerator()) && (getDenominator() == f.getDenominator()) );
}
bool Fraction::operator !=(const Fraction& f) const {
return !( (getNumerator() == f.getNumerator()) && (getDenominator() == f.getDenominator()) );
}
bool Fraction::operator <(const Fraction& f) const {
double a = getNumerator();
double b = getDenominator();
double c = getNumerator();
double d = getDenominator();
return ((a/b) < (c/d));
}
bool Fraction::operator <=(const Fraction& f) const {
double a = getNumerator();
double b = getDenominator();
double c = getNumerator();
double d = getDenominator();
return ((a/b) <= (c/d));
}
bool Fraction::operator >(const Fraction& f) const {
double a = getNumerator();
double b = getDenominator();
double c = getNumerator();
double d = getDenominator();
return ((a/b) > (c/d));
}
bool Fraction::operator >=(const Fraction& f) const {
double a = getNumerator();
double b = getDenominator();
double c = getNumerator();
double d = getDenominator();
return ((a/b) >= (c/d));
}
ostream& operator <<(ostream& out, const Fraction& f) {
out << f.getNumerator() << "/" << f.getDenominator();
return out;
}
istream& operator >>(istream& in, Fraction& f) {
int a;
int b;
in >> a >> b;
f.setNumerator(a);
f.setDenominator(b);
return in;
}
Fraction.h
#ifndef __hw05__Fraction__
#define __hw05__Fraction__
#include <iostream>
#include <string>
using namespace std;
class Fraction {
private:
int numerator;
int denominator;
int gcd() const;
public:
Fraction(const int numerator = 0, const int denominator = 0);
int getNumerator() const;
int getDenominator() const;
void setNumerator(const int numerator);
void setDenominator(const int denominator);
string toString() const;
double returnDecimal() const;
void reduce();
bool operator ==(const Fraction& f) const;
bool operator !=(const Fraction& f) const;
bool operator <(const Fraction& f) const;
bool operator <=(const Fraction& f) const;
bool operator >(const Fraction& f) const;
bool operator >=(const Fraction& f) const;
Fraction operator +(const Fraction& f) const;
Fraction operator -(const Fraction& f) const;
Fraction operator *(const Fraction& f) const;
Fraction operator /(const Fraction& f) const;
friend ostream& operator <<(ostream&, const Fraction&);
friend istream& operator >>(istream&, Fraction&);
};
#endif /* d
答案 0 :(得分：2)
在main.cpp：
#include "Fraction.cpp"
不要include源文件。 Include个头文件（例如Fraction.h）。
修改
您似乎编写了大量代码而未对其进行任何测试。这就是为什么你被迫一次修复一个错误的原因，并希望你没有把所有的时间花在一个结果是不可行的方法上。
从小而简单开始，一次添加一点复杂性，在每一步测试，单独开发新功能，永远不会添加到无法正常工作的代码。
答案 1 :(得分：2)
Fraction.cpp单独编译并稍后链接。要使用main.cpp中的成员，您需要Fraction.h。
所以只需删除该行：
#include Fraction.cpp
你应该没事。
答案 2 :(得分：0)
你的main.cpp包含了fraction.cpp。因此，fraction.cpp的代码在生成的二进制文件中出现两次，这解释了＆＃34;已定义的＆＃34;消息。
答案 3 :(得分：0)
你的函数int Fraction :: gcd（）const;在Fraction.h中声明，但未定义。