第八周项目3——分数类中的运算符重载(四则运算)
2015-04-28 13:11
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(2)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。
代码如下:
![](https://oscdn.geek-share.com/Uploads/Images/Content/201504/e309b7775dda67bf0767aa21839c2b53)
总结:我也是醉了,坚持编完已经是很了不起了。可惜没有单步执行下次再来;
代码如下:
#include <iostream> int gcd(int m,int n); using namespace std; class CFraction { private: int nume; // 分子 int deno; // 分母 public: //构造函数及运算符重载的函数声明 CFraction(int nu=0,int de=1):nume(nu),deno(de) {} void simplify(); void display(); friend CFraction operator+(const CFraction &c1, const CFraction &c2); //两个分数相加,结果要化简 friend CFraction operator-(const CFraction &c1, const CFraction &c2); //两个分数相减,结果要化简 friend CFraction operator*(const CFraction &c1, const CFraction &c2); //两个分数相乘,结果要化简 friend CFraction operator/(const CFraction &c1, const CFraction &c2); //两个分数相除,结果要化简 friend CFraction operator+(const CFraction &c, int i); friend CFraction operator+(int i, const CFraction &c ); friend CFraction operator-(const CFraction &c, int i); friend CFraction operator-(int i, const CFraction &c ); friend CFraction operator*(const CFraction &c, int i); friend CFraction operator*(int i, const CFraction &c ); friend CFraction operator/(const CFraction &c, int i); friend CFraction operator/(int i, const CFraction &c ); CFraction operator+(); //取正一目运算 CFraction operator-(); //取反一目运算 friend bool operator>(const CFraction &c1, const CFraction &c2); friend bool operator<(const CFraction &c1, const CFraction &c2); friend bool operator==(const CFraction &c1, const CFraction &c2); friend bool operator!=(const CFraction &c1, const CFraction &c2); friend bool operator>=(const CFraction &c1, const CFraction &c2); friend bool operator<=(const CFraction &c1, const CFraction &c2); friend bool operator>(const CFraction &c, int i); friend bool operator>(int i, const CFraction &c); friend bool operator<(const CFraction &c, int i); friend bool operator<(int i, const CFraction &c); friend bool operator==(const CFraction &c, int i); friend bool operator==(int i, const CFraction &c); friend bool operator!=(const CFraction &c, int i); friend bool operator!=(int i, const CFraction &c); friend bool operator>=(const CFraction &c, int i); friend bool operator>=(int i, const CFraction &c); friend bool operator<=(const CFraction &c, int i); friend bool operator<=(int i, const CFraction &c); }; //重载函数的实现及用于测试的main()函数 int gcd(int m,int n) { int t; if(m<n) { t=m; m=n; n=t; } while(t=m%n) { m=n; n=t; } return n; } void CFraction::simplify() { int n=gcd(nume,deno); nume/=n; deno/=n; } void CFraction::display() { cout<<"("<<nume<<"/"<<deno<<")"<<endl; } CFraction operator+(const CFraction &c1, const CFraction &c2) { CFraction z; z.nume=c1.nume*c2.deno+c2.nume*c1.deno; z.deno=c1.deno*c2.deno; z.simplify(); return z; } CFraction operator-(const CFraction &c1, const CFraction &c2) { CFraction z; z.nume=c1.nume*c2.deno-c2.nume*c1.deno; z.deno=c1.deno*c2.deno; z.simplify(); return z; } CFraction operator*(const CFraction &c1, const CFraction &c2) { CFraction z; z.nume=c1.nume*c2.nume; z.deno=c1.deno*c2.deno; z.simplify(); return z; } CFraction operator/(const CFraction &c1, const CFraction &c2) { CFraction z; if(c2.nume==0) return c1; z.nume=c1.nume*c2.deno; z.deno=c1.deno*c2.nume; z.simplify(); return z; } CFraction operator+(const CFraction &c, int i) { CFraction c1(c.nume+i*c.deno,c.deno); c1.simplify(); return c1; } CFraction operator+(int i, const CFraction &c ) { CFraction c1(c.nume+i*c.deno,c.deno); c1.simplify(); return c1; } CFraction operator-(const CFraction &c, int i) { CFraction c1(c.nume-i*c.deno,c.deno); c1.simplify(); return c1; } CFraction operator-(int i, const CFraction &c ) { CFraction c1(i*c.deno-c.nume,c.deno); c1.simplify(); return c1; } CFraction operator*(const CFraction &c, int i) { CFraction c1(c.nume*i,c.deno); c1.simplify(); return c1; } CFraction operator*(int i, const CFraction &c ) { CFraction c1(c.nume*i,c.deno); c1.simplify(); return c1; } CFraction operator/(const CFraction &c, int i) { CFraction c1(c.nume,c.deno*i); c1.simplify(); return c1; } CFraction operator/(int i, const CFraction &c ) { CFraction c1(i*c.deno,c.nume); c1.simplify(); return c1; } CFraction CFraction:: operator+() { return *this; } CFraction CFraction:: operator-() { CFraction c; c.nume=-nume; c.deno=-deno; return c; } bool operator>(const CFraction &c1, const CFraction &c2) { int c1_nume,c2_nume,com_deno; c1_nume=c1.nume*c2.deno; c2_nume=c2.nume*c1.deno; com_deno=c1.deno*c2.deno; if((c1_nume-c2_nume)*com_deno>0) return true; return false; } bool operator<(const CFraction &c1, const CFraction &c2) { int c1_nume,c2_nume,com_deno; c1_nume=c1.nume*c2.deno; c2_nume=c2.nume*c1.deno; com_deno=c1.deno*c2.deno; if((c1_nume-c2_nume)*com_deno<0) return true; return false; } bool operator==(const CFraction &c1, const CFraction &c2) { if(c1<c2||c1>c2) return false; return true; } bool operator!=(const CFraction &c1, const CFraction &c2) { if(c1==c2) return false; return true; } bool operator>=(const CFraction &c1, const CFraction &c2) { if(c1<c2) return false; return true; } bool operator<=(const CFraction &c1, const CFraction &c2) { if(c1>c2) return false; return true; } bool operator>(const CFraction &c, int i) { if(c.deno>0) return c.nume>(i*c.deno); else return c.nume<(i*c.deno); } bool operator>(int i, const CFraction &c) { if(c.deno>0) return (i*c.deno)>c.nume; else return (i*c.deno)<c.nume; } bool operator<(const CFraction &c, int i) { if(c.deno>0) return c.nume<(i*c.deno); else return c.nume>(i*c.deno); } bool operator<(int i, const CFraction &c) { if(c.deno>0) return (i*c.deno)<c.nume; else return (i*c.deno)>c.nume; } bool operator==(const CFraction &c, int i) { return c.nume==(i*c.deno); } bool operator==(int i, const CFraction &c) { return c.nume==(i*c.deno); } bool operator!=(const CFraction &c, int i) { return c.nume!=(i*c.deno); } bool operator!=(int i, const CFraction &c) { return c.nume!=(i*c.deno); } bool operator>=(const CFraction &c, int i) { return !(c<i); } bool operator>=(int i, const CFraction &c) { return !(i<c); } bool operator<=(const CFraction &c, int i) { return !(c>i); } bool operator<=(int i, const CFraction &c) { return !(i>c); } int main() { CFraction x(10,5),y(3,9),s; x.display(); y.display(); cout<<endl; s=x+y; cout<<"x+y="; s.display(); s=x-y; cout<<"x-y="; s.display(); s=x*y; cout<<"x*y="; s.display(); s=x/y; cout<<"x/y="; s.display(); if (x>y) cout<<"大于"<<endl; if (x<y) cout<<"小于"<<endl; if (x==y) cout<<"等于"<<endl; if (x>=y) cout<<"大于等于"<<endl; if (x<=y) cout<<"小于等于"<<endl; if (x!=y) cout<<"不等于"<<endl; cout<<endl; CFraction c1(5,3),c2; //以下建议在调试环境中完成测试, c2=c1+5; c2=5+c1; c2=c1-5; c2=5-c1; c2=c1*5; c2=5*c1; c2=c1/5; c2=5/c1; bool b; b=(c1>2); b=(2>c1); return 0; }
总结:我也是醉了,坚持编完已经是很了不起了。可惜没有单步执行下次再来;
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