public:
static const double absError=0.0000001;
static bool IsEqual(double a, double b)
{
if (a==b)
return true;
if (fabs(a-b)<absError)
return true;
return false;
}
/**重載賦值運算符後 交換兩個類的數據**/
void swap(Distance& d)
{
Distance temp;
temp=*this;
*this=d;
d=temp;
}
/*** overloaded < operator 重載小於號 ***/
bool operator <(const Distance& d)
{
if((feet - d.feet<absError)||(feet == d.feet && inches - d.inches<absError))
{
return true;
}
return false;
}
/*** overloaded > operator 重載大於號***/
bool operator > (const Distance& d)
{
if((feet -d.feet>absError)||(feet == d.feet && inches - d.inches>absError))
{
return true;
}
return false;
}
/*** overloaded == operator 重載等於號 ***/
bool operator ==(const Distance& d)
{
if(IsEqual(feet,d.feet) && IsEqual(inches,d.inches))
{
return true;
}
return false;
}
[cpp]
#include <iostream>
#include <math.h>
using namespace std;
class Distance
{
private:
double feet; // 0 to infinite
double inches;
public:
static const double absError=0.0000001;
static bool IsEqual(double a, double b)
{
if (a==b)
return true;
if (fabs(a-b)<absError)
return true;
return false;
}
// required constructors
Distance()
{
feet = 0;
inches = 0;
}
Distance(double f, double i)
{
feet = f;
inches = i;
}
/**重新設置數據**/
void set(double f, double i)
{
feet = f;
inches = i;
}
/**重載賦值運算符後 交換兩個類的數據**/
void swap(Distance& d)
{
Distance temp;
temp=*this;
*this=d;
d=temp;
}
// method to display distance
void displayDistance()
{
cout <<" Feet: " << feet << " Inches:" << inches <<endl;
}
/*** overloaded minus (-) operator ***/
Distance operator- ()
{
feet = -feet;
inches = -inches;
return Distance(feet, inches);
}
/*** overloaded < operator 重載小於號 ***/
bool operator <(const Distance& d)
{
if((feet - d.feet<absError)||(feet == d.feet && inches - d.inches<absError))
{
return true;
}
return false;
}
/*** overloaded > operator 重載大於號***/
bool operator > (const Distance& d)
{
if((feet -d.feet>absError)||(feet == d.feet && inches - d.inches>absError))
{
return true;
}
return false;
}
/*** overloaded == operator 重載等於號 ***/
bool operator ==(const Distance& d)
{
if(IsEqual(feet,d.feet) && IsEqual(inches,d.inches))
{
return true;
}
return false;
}
};
int main()
{
Distance D1(20.08,5.12 ), D2(20.13, 4.20);
cout<<"before swap :\n";
cout<<"D1:----> ";
D1.displayDistance();
cout<<"D2:----> ";
D2.displayDistance();
if( D1 < D2 )
{
cout << "D1 is less than D2 " << endl;
}
else
{
cout << "D2 is less than D1 " << endl;
}
D1.swap(D2);
cout<<"after swap :\n";
cout<<"D1:----> ";
D1.displayDistance();
cout<<"D2:----> ";
D2.displayDistance();
if( D1 < D2 )
{
cout << "D1 is less than D2 " << endl;
}
else
{
cout << "D2 is less than D1 " << endl;
}
double a=0.33,b=0.33;
cout<<"\ndouble a=0.33,b=0.33 then Distance::IsEquall(a,b) = "
<<Distance::IsEqual(a,b)<<endl;
cout<<"after set(199.1,11.05)\n";
D1.set(199.1,11.05);
D2.set(199.1,11.05);
D1.displayDistance();
D2.displayDistance();
if(D1==D2)
{
cout<<"\n D1 equal D2 \n";
}
return 0;
}
/**************************
運行結果：
before swap :
D1:----> Feet: 20.08 Inches:5.12
D2:----> Feet: 20.13 Inches:4.2
D1 is less than D2
after swap :
D1:----> Feet: 20.13 Inches:4.2
D2:----> Feet: 20.08 Inches:5.12
D2 is less than D1
double a=0.33,b=0.33 then Distance::IsEquall(a,b) = 1
after set(199.1,11.05)
Feet: 199.1 Inches:11.05
Feet: 199.1 Inches:11.05
D1 equal D2
Process returned 0 (0x0) execution time : 0.894 s
Press any key to continue.
****************************/
#include <iostream>
#include <math.h>
using namespace std;
class Distance
{
private:
double feet; // 0 to infinite
double inches;
public:
static const double absError=0.0000001;
static bool IsEqual(double a, double b)
{
if (a==b)
return true;
if (fabs(a-b)<absError)
return true;
return false;
}
// required constructors
Distance()
{
feet = 0;
inches = 0;
}
Distance(double f, double i)
{
feet = f;
inches = i;
}
/**重新設置數據**/
void set(double f, double i)
{
feet = f;
inches = i;
}
/**重載賦值運算符後 交換兩個類的數據**/
void swap(Distance& d)
{
Distance temp;
temp=*this;
*this=d;
d=temp;
}
// method to display distance
void displayDistance()
{
cout <<" Feet: " << feet << " Inches:" << inches <<endl;
}
/*** overloaded minus (-) operator ***/
Distance operator- ()
{
feet = -feet;
inches = -inches;
return Distance(feet, inches);
}
/*** overloaded < operator 重載小於號 ***/
bool operator <(const Distance& d)
{
if((feet - d.feet<absError)||(feet == d.feet && inches - d.inches<absError))
{
return true;
}
return false;
}
/*** overloaded > operator 重載大於號***/
bool operator > (const Distance& d)
{
if((feet -d.feet>absError)||(feet == d.feet && inches - d.inches>absError))
{
return true;
}
return false;
}
/*** overloaded == operator 重載等於號 ***/
bool operator ==(const Distance& d)
{
if(IsEqual(feet,d.feet) && IsEqual(inches,d.inches))
{
return true;
}
return false;
}
};
int main()
{
Distance D1(20.08,5.12 ), D2(20.13, 4.20);
cout<<"before swap :\n";
cout<<"D1:----> ";
D1.displayDistance();
cout<<"D2:----> ";
D2.displayDistance();
if( D1 < D2 )
{
cout << "D1 is less than D2 " << endl;
}
else
{
cout << "D2 is less than D1 " << endl;
}
D1.swap(D2);
cout<<"after swap :\n";
cout<<"D1:----> ";
D1.displayDistance();
cout<<"D2:----> ";
D2.displayDistance();
if( D1 < D2 )
{
cout << "D1 is less than D2 " << endl;
}
else
{
cout << "D2 is less than D1 " << endl;
}
double a=0.33,b=0.33;
cout<<"\ndouble a=0.33,b=0.33 then Distance::IsEquall(a,b) = "
<<Distance::IsEqual(a,b)<<endl;
cout<<"after set(199.1,11.05)\n";
D1.set(199.1,11.05);
D2.set(199.1,11.05);
D1.displayDistance();
D2.displayDistance();
if(D1==D2)
{
cout<<"\n D1 equal D2 \n";
}
return 0;
}
/**************************
運行結果：
before swap :
D1:----> Feet: 20.08 Inches:5.12
D2:----> Feet: 20.13 Inches:4.2
D1 is less than D2
after swap :
D1:----> Feet: 20.13 Inches:4.2
D2:----> Feet: 20.08 Inches:5.12
D2 is less than D1
double a=0.33,b=0.33 then Distance::IsEquall(a,b) = 1
after set(199.1,11.05)
Feet: 199.1 Inches:11.05
Feet: 199.1 Inches:11.05
D1 equal D2
Process returned 0 (0x0) execution time : 0.894 s
Press any key to continue.
****************************/
運行結果：
before swap :
D1:----> Feet: 20.08 Inches:5.12
D2:----> Feet: 20.13 Inches:4.2
D1 is less than D2
after swap :
D1:----> Feet: 20.13 Inches:4.2
D2:----> Feet: 20.08 Inches:5.12
D2 is less than D1
double a=0.33,b=0.33 then Distance::IsEquall(a,b) = 1
after set(199.1,11.05)
Feet: 199.1 Inches:11.05
Feet: 199.1 Inches:11.05
D1 equal D2
