C++课程实验7.docVIP

/*（）先读程序，写出程序的输出结果， 再运行程序验证程序的输出。用友元重载方式重新编写程序*/ #include iostream using namespace std; class Vector { public: Vector(){} Vector(int i,int j) {x=i;y=j;} friend Vector operator+=(Vector v1,Vector v2) { v1.x+=v2.x; v1.y+=v2.y; return v1; } friend Vector operator-=(Vector v, Vector u) { //Vector temp; //temp.x=x-v.x; //temp.y=y-v.y; //return temp; v.x-=u.x; v.y-=u.y; return v; } void display() { cout(x,y)endl;} private: int x,y; }; void main() { Vector v1(1,2),v2(3,4),v3,v4; v3=v1+=v2; v4=v1-=v2; coutv1=; v1.display(); coutv2=; v2.display(); coutv3=; v3.display(); coutv4=; v4.display(); } /*（）定义一个有理数类， 重载比较运算符.写一个完整的程序，进行数据成员的设置和输出*/ #includeiostream using namespace std; class rational { private: long denom,den; //denom为分子,den为分母 public: rational(int num=0, int denom=1); int operator (rational r) const; int operator = (rational r) const; int operator == (rational r) const; int operator != (rational r) const; //这里增加赋值和读出函数 void getdd() { cout Enter the denom: endl; cin denom; cout Enter the den endl; cin den; } void showdd() { cout denom = denom endl; cout den = den endl; } }; rational::rational(int num , int denom ) { this-den = num; this-denom = denom; } int rational::operator (rational r) const { double f1 = denom/den; double f2 = r.denom/r.den; return ( f1 f2 )? 1 : 0; } int rational::operator = (rational r) const { double f1 = denom/den; double f2 = r.denom/r.den; return ( f1 = f2 )? 1 : 0; } int rational::operator == (rational r) const { double f1 = denom/den; double f2 = r.denom/r.den; return ( f1 == f2 )? 1 : 0; } int rational::operator != (rational r) const { double f1 = denom/den; double f2 = r.denom/r.den; return ( f1 != f2 )? 1 : 0; } void main() { rational rat1; rat1.getdd(); rat1.showdd(); rational rat2(3,5); rat2.showdd(); if ( rat1 rat2 ) cout rat1 is less than rat2! endl; else if ( rat1 = rat2 ) cout rat1 is less than or equal to rat2! e