实验五运算符重载

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#include<iostream>#include<string.h>using namespace std;class Rational//定义一个有理数类 {public:  Rational (int  num=0,int  denom=1);   // Rational() {}  ~ Rational() {}   int operator<(Rational &r)  const ;   int operator<=(Rational &r) const;   int operator==(Rational &r) const;   int operator!=(Rational &r) const;  friend ostream& operator<<(ostream &o,const Rational &c) ;  friend istream& operator>>(istream &i,const Rational &c);private://定义一个有理数num为分母，den为分子 long  num,den;};Rational::Rational(int   num,int  denom){this->num=num;this->den=denom;}int  Rational::operator<(Rational &r) const{ if(r.num*den-num*r.den<0) return 1;  else return 0;}int  Rational::operator<=(Rational &r) const{ if(r.num*den-num*r.den<0) return 1;  else return 0;}int  Rational::operator==(Rational &r) const{ if(r.num*den-num*r.den==0) return 1;  else return 0;}int  Rational::operator!=(Rational &r) const{ if(r.num*den-num*r.den!=0) return 1;  else return 0;}ostream& operator<<(ostream&o,const Rational &c) { o<<"("<<c.num<<","<<c.den<<")";return o;}//下面这个输入流的重载这个不用要。。。。istream& operator>>(istream& i,const Rational &c){ i>>c.num>>c.den;return i;}int main(){ Rational a(2,1);  Rational b(3,1);  Rational c(2,1);  Rational d(4,1);  if(a<b)  cout<<a<<"< "<<b<<endl;   else  cout<<a<<" >="<<b<<endl;  if(a==c) cout<<a<<"=="<<c<<endl;  else  cout<<a<<"!="<<c<<endl;  if(d<=a) cout<<d<<"<="<<a<<endl;  else  cout<<a<<">"<<d<<endl;  system("pause");    }