c++高手帮帮忙啊

[yuanjihua9205]

类Distances定义了3个变量：feet，yards，miles。下面4个方法是对类Distances的成员变量进行操作的：
addDistances：该方法把类Distances的两个变量相加并将结果存储在类Distance的第3个变量中。例如，2英里1750码2英尺+0英里10码2英尺=3英里1码1英尺。
convertFeet：该方法把英尺转换为Distances类型的变量。例如，6002英尺可被转换为1英里240码2英尺。
convertYards：该方法把码转换为Distances类型的变量类型。例如，5230码可转换为2英里1710码0英尺。
printDistance：该方法用来打印类Distances的变量值。
const int FEET_IN_YARDS=3;
const int YARDS_IN_MILES=1760;
class Distances
{
/*请在此输入数据成员的定义*/
public:
Distances();
Distance addDistance(Distance two);
static Distance convertYards(long yards);
static Distance convertFeet(long feet);
static void printDistance(Distance);
}
要求a: 请把上面各个方法体定义完整
b：请编写一个可以用来测试上述方法的main函数，要求用上述说明中给出的数据进行测试。

[yuanjihua9205]

万分感谢

[qzl123666]

class Distances
{
protected:
long feet，yards，miles;
public:
Distances();
Distances(long f,long y,long m):feet(f),yards(y),miles(m){};
Distances(Distances d):feet(d.feet),yards(d.yards),miles(d.yards){};
Distance addDistance(Distance two){
return Distance(this->feet+two.feet,this->yards+two.yards,this->miles+two.miles);
};
static Distance convertYards(long yards)
{
long m=yards/1760;
long y=yards%1760;
return Distances(0,y,m);
};
static Distance convertFeet(long feet)
{
long m=feet/5280;
long y=(feet%5280)/3;
long f=(feet%5280)%3;
return Distances(f,y,m);
} ;
static void printDistance(Distance d){
cout<< "feet:"<<d.feet
<< "yards:"<<d.yards
<<"miles:"<<d.miles<<endl;
};
}

[alwang_2008]

同意楼上的，建议数据feet，yards，miles定义成private的

[alwang_2008]

同意楼上的，建议数据feet，yards，miles定义成private的

[yuanjihua9205]

那个程序执行不出来啊？

[qzl123666]

#include "stdafx.h"
#include <iostream>
using namespace std;
class Distances
{
private:
long feet,yards,miles;
public:
Distances():feet(0),yards(0),miles(0){};
Distances(long f,long y,long m):feet(f),yards(y),miles(m){};
//Distances(Distances d):feet(d.feet),yards(d.yards),miles(d.yards){};
Distances addDistance(Distances two){
return Distances(this->feet+two.feet,this->yards+two.yards,this->miles+two.miles);
};
static Distances convertYards(long yards)
{
long m=yards/1760;
long y=yards%1760;
return Distances(0,y,m);
};
static Distances convertFeet(long feet)
{
long m=feet/5280;
long y=(feet%5280)/3;
long f=(feet%5280)%3;
return Distances(f,y,m);
} ;
static void printDistance(Distances d){
cout << "feet:" <<d.feet
<< "yards:" <<d.yards
<<"miles:" <<d.miles <<endl;
};
};

int main()
{
Distances ds=Distances(56,441,322);
Distances::printDistance(ds);
ds=Distances::convertFeet(10000);
Distances::printDistance(ds);
ds=Distances::convertYards(56561);
Distances::printDistance(ds);
}