第十三周项目

第十三周项目

/*copyright(c)2016.烟台大学计算机学院* All rights reserved,* 文件名称：text.Cpp* 作者：刘涛* 完成日期：2016年5月21日* 版本号：vc++6.0*问题描述：在（1）的基础上，实现分数类中的对象和整型数的四则运算。分数类中的对象可以和整型数进行四则运算，且运算符合交换律。例如：CFraction a(1,3),b; int i=2; 可以完成b=a+i;。同样，可以完成i+a, 45+a, a*27, 5/a等各种运算。*/
#include <iostream>
#include <Cmath>
using namespace std;
class CFraction
{
private:int nume;  // 分子int deno;  // 分母
public:CFraction(int nu=1,int de=1):nume(nu),deno(de) {}friend CFraction operator+(const CFraction &c1,const CFraction &c2);//重载加法friend CFraction operator-(const CFraction &c1,const CFraction &c2);//重载减法friend CFraction operator*(const CFraction &c1,const CFraction &c2);//重载乘法friend CFraction operator/(const CFraction &c1,const CFraction &c2);//重载除法friend CFraction operator+(const CFraction &c1,double &d);friend CFraction operator-(const CFraction &c1,double &d);friend CFraction operator*(const CFraction &c1,double &d);friend CFraction operator/(const CFraction &c1,double &d);//二目的比较运算符重载bool operator > (const CFraction &c2);bool operator < (const CFraction &c2);bool operator >= (const CFraction &c2);bool operator <= (const CFraction &c2);bool operator == (const CFraction &c2);bool operator != (const CFraction &c2);//输入输出的重载friend istream &operator>>(istream &in,CFraction &x);friend ostream &operator<<(ostream &out,CFraction x);void simplify();//分数化简
};
// 重载输入运算符>>
istream &operator>>(istream &in,CFraction &x)
{char ch;while(1){cin>>x.nume>>ch>>x.deno;if (x.deno==0)cerr<<"分母为0, 请重新输入n";else if(ch!='/')cerr<<"格式错误（形如m/n）! 请重新输入n";elsebreak;}return cin;
}
/*------------------------------------------------------------------*/
// 重载输出运算符<<
ostream &operator<<(ostream &out,CFraction x)
{cout<<x.nume<<'/'<<x.deno;return cout;
}
//重载加法
CFraction operator+(const CFraction &c1,const CFraction &c2)
{CFraction a;a.nume=c1.nume*c2.deno+c2.nume*c1.deno;a.deno=c1.deno*c2.deno;a.simplify();return a;
}
//重载减法
CFraction operator-(const CFraction &c1,const CFraction &c2)
{CFraction a;a.nume=c1.nume*c2.deno-c2.nume*c1.deno;a.deno=c1.deno*c2.deno;a.simplify();return a;
}
//重载乘法
CFraction operator*(const CFraction &c1,const CFraction &c2)
{CFraction a;a.nume=c1.nume*c2.nume;a.deno=c1.deno*c2.deno;a.simplify();return a;
}//重载除法
CFraction operator/(const CFraction &c1,const CFraction &c2)
{CFraction a;a.nume=c1.nume*c2.deno;a.deno=c1.deno*c2.nume;a.simplify();return a;
}/*--------------------------------------------------------------------------*/CFraction operator+(const CFraction &c1,double &d){CFraction b;b.nume=c1.deno+c1.nume*d;b.deno=c1.nume;b.simplify();return b;}CFraction operator-(const CFraction &c1,double &d){CFraction b;b.nume=c1.deno-c1.nume*d;b.deno=c1.nume;b.simplify();return b;}CFraction operator*(const CFraction &c1,double &d){CFraction b;b.nume=c1.nume*d;b.deno=c1.deno;b.simplify();return b;}CFraction operator/(const CFraction &c1,double &d){CFraction b;b.nume=c1.nume;b.deno=c1.deno*d;b.simplify();return b;}
/*----------------------------------------------------------------------------*/
//二目的比较运算符重载
bool CFraction:: operator > (const CFraction &c2)
{int this_nume,c2_nume;this_nume=nume*c2.deno;c2_nume=c2.nume*deno;if(this_nume>c2_nume)return true;return false;
}
bool CFraction:: operator < (const CFraction &c2)
{int this_nume,c2_nume;this_nume=nume*c2.deno;c2_nume=c2.nume*deno;if(this_nume<c2_nume)return true;return false;
}
bool CFraction::operator==(const CFraction &c2)
{if (*this!=c2) return false;return true;
}bool CFraction::operator!=(const CFraction &c2)
{if (*this>c2 || *this<c2) return true;return false;
}bool CFraction::operator>=(const CFraction &c2)
{if (*this<c2) return false;return true;
}bool CFraction::operator<=(const CFraction &c2)
{if (*this>c2) return false;return true;
}
void CFraction::simplify()
{int de,nu,r;de=fabs(deno);nu=fabs(nume);while(r=nu%de)  // 求m，n的最大公约数{nu=de;de=r;}deno/=de;     // 化简nume/=de;if (deno<0)  // 将分母转化为正数{deno=-deno;nume=-nume;}
}int main()
{CFraction c1,c2,s;int d;cout<<"输入c1: ";cin>>c1;cout<<"输入c2: ";cin>>c2;cout<<"输入一个实数:";cin>>d;s=c1+c2;cout<<"c1+c2="<<s<<endl;;s=c1-c2;cout<<"c1-c2="<<s<<endl;;s=c1*c2;cout<<"c1*c2="<<s<<endl;;s=c1/c2;cout<<"c1/c2="<<s<<endl;;s=c1+d;cout<<"c1+d="<<s<<endl;;s=c1-d;cout<<"c1-d="<<s<<endl;;s=c1*d;cout<<"c1*d="<<s<<endl;;s=c1/d;cout<<"c1/d="<<s<<endl;;if (c1>c2) cout<<"c1>c2"<<endl;if (c1<c2) cout<<"c1<c2"<<endl;if (c1==c2) cout<<"c1＝c2"<<endl;if (c1!=c2) cout<<"c1≠c2"<<endl;if (c1>=c2) cout<<"c1≥c2"<<endl;if (c1<=c2) cout<<"c1<=c2"<<endl;return 0;
}

运行结果：

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学习心得：老师，这里没有明白符合交换律是指实数和分数的位置可以交换吗，但是成员函数参数的位置固定怎么可以交换呢？

还有一个问题就是当分母约为1的时候，怎么调整重载的输出函数把1和/去掉呢？