2012年 上半年 第九周 C++程序设计 (二十八)
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#include <iostream> using namespace std; int gcd(int m, int n); 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); //构造函数,初始化用 void Simplify(); //化简(使分子分母没有公因子) void output(); //输出:以8/6为例,style为0时,输出8/6; bool operator > (CFraction &t); bool operator < (CFraction &t); bool operator >= (CFraction &t); bool operator <= (CFraction &t); bool operator == (CFraction &t); bool operator != (CFraction &t); CFraction operator+(CFraction &c); CFraction operator-(CFraction &c); CFraction operator*(CFraction &c); CFraction operator/(CFraction &c); CFraction operator-(); friend ostream &operator << (ostream &,CFraction &); friend istream &operator >> (istream &,CFraction &);};istream &operator >> (istream &input,CFraction &c) { input>>c.nume>>c.deno; return input; }ostream &operator << (ostream &output,CFraction &c) { output<<c.nume<<'/'<<c.deno<<endl; return output; }CFraction::CFraction(int nu,int de) //构造函数,初始化用 { if (de!=0) { nume=nu; deno=de; } else { cerr<<"初始化中发生错误,程序退出\n"; exit(0); } } void CFraction::Simplify() //化简(使分子分母没有公因子) { int n; if(nume<0) { n=gcd(-nume,deno); } else { n=gcd(nume,deno); }nume=nume/n; deno=deno/n; } // 求m,n的最大公约数 int gcd(int m, int n) {int r; if (m<n){r=m;m=n;n=r;} while(r=m%n) // 求m,n的最大公约数 { m=n; n=r; } return n; } bool CFraction::operator > (CFraction &t) { CFraction c2,c3; c2.nume=nume*t.deno ; c3.nume=t.nume*deno; if(c2.nume>c3.nume ) return true; else return false; }bool CFraction::operator < (CFraction &t) { CFraction c2,c3; c2.nume=nume*t.deno ; c3.nume=t.nume*deno; if(c2.nume<c3.nume ) return true; else return false; }bool CFraction::operator >= (CFraction &t) { CFraction c1; c1.nume=nume; c1.deno=deno; if (c1<t) return false; return true; } bool CFraction::operator <= (CFraction &t) { CFraction c1; c1.nume=nume; c1.deno=deno; if(c1>t) return false; return true; } bool CFraction::operator == (CFraction &t) { CFraction c1; c1.nume=nume; c1.deno=deno; if (c1<t) return false; if (c1>t) return false; return false; } bool CFraction::operator != (CFraction &t) { CFraction c1; c1.nume=nume; c1.deno=deno; if (c1==t) return false; return true; }CFraction CFraction::operator+(CFraction &c) { CFraction c2,c3,c4; c2.nume=nume*c.deno ; c3.nume=c.nume *deno; c2.deno=deno*c.deno ; c3.deno=c.deno *deno; c4.nume=c2.nume +c3.nume ; c4.deno=c2.deno ; c4.Simplify (); return c4; }CFraction CFraction::operator-(CFraction &c) { CFraction c2,c3,c4; c2.nume=nume*c.deno ; c3.nume=c.nume*deno; c2.deno=deno*c.deno ; c3.deno=c.deno*deno; c4.nume=c2.nume-c3.nume ; c4.deno=c2.deno ; c4.Simplify (); return c4; }CFraction CFraction::operator*(CFraction &c) { CFraction c2,c3,c4; c2.nume=nume*c.nume ; c2.deno=deno*c.deno ; c2.Simplify(); return c2; }CFraction CFraction::operator/(CFraction &c) { CFraction c2,c3; c2.nume=c.deno ; c2.deno=c.nume ; c3.nume=nume*c2.nume ; c3.deno=deno*c2.deno ; c3.Simplify (); return c3; }CFraction CFraction::operator-() { CFraction c2; c2.nume=nume; c2.deno=deno; c2.Simplify (); if(c2.nume<0 || c2.deno<0) { if(c2.nume <0) { c2.nume=-nume; } else { c2.deno=-deno; } } else { c2.nume=-nume; c2.deno=deno; } return c2; } //用于测试的main()函数 void main() { CFraction c1,c2,c; cout<<"请您输入一个分数c1:(以a b的形式输入)"; cin>>c1; cout<<"请您输入一个分数c1:(以a b的形式输入)"; cin>>c2; cout<<"c1为:"; cout<<c1; cout<<"c2为:"; cout<<c2; cout<<"下面比较两个时间大小:\n"; 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; cout<<endl; cout<<"c1+c2的数值为:"; c=c1+c2; cout<<c; cout<<endl; cout<<"c1-c2的数值为:"; c=c1-c2; cout<<c; cout<<endl; cout<<"c1*c2的数值为:"; c=c1*c2; cout<<c; cout<<endl; cout<<"c1/c2的数值为:"; c=c1/c2; cout<<c; cout<<endl; cout<<"对c1取反的结果为:"; c=-c1; cout<<c; cout<<endl; }