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实验四-运算符重载-实验报告.doc

发布:2017-12-16约3.98千字共6页下载文档
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实验报告 实验目的:掌握运算符重载的语法要点,学会运算符重载的编程方法。 实验内容: (1)先读程序,预测程序的输出结果,再运行程序验证程序的输出。用友元重载方式重新编写次程序。 #include iostream.h 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; } Vector operator-=(Vector v) { Vector temp; temp.x=x-v.x; temp.y=y-v.y; return temp; } 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(); } 运行结果: v1=(1,2) v2=(3,4) v3=(4,6) v4=(-2,-2) Press any key to continue 用友元重载方式重新编写次程序: #include iostream using namespace std; class Vector { public: Vector(int i = 0,int j = 0) { 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 v1,Vector v2) { v1.x=v1.x-v2.x; v1.y=v1.y-v2.y; return Vector( v1.x, v1.y); } 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();//1,2 coutv2=; v2.display();//3,4 coutv3=; v3.display();//4,6 coutv4=; v4.display();//1,2 } 运行结果: v1=(1,2) v2=(3,4) v3=(4,6) v4=(-2,-2) Press any key to continue (2)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.h class rational { private: long denom,den; public: rational(long num=0, long denom1=1) { denom=num; den=denom1; } int operator(rational r) const { double x,y; x=denom*1.0/den; y=r.denom*1.0/r.den; if(xy) return 1; return 0; } int operator=(rational r) const { double x,y; x=denom*1.0/den; y=r.denom*1.0/r.den; if(x=y) return 1; return 0; } int operator==(rational r) const { double x,y; x=denom*1.0/den; y=r.denom*1.0/r.den; if(x==y) return 1; return 0; } int operator!=(rational r) const { double x,y; x=denom*1.0/den; y=r.denom*1.0/r.den; if(x!=y) ret
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