7运算符重载教程.ppt

第7章 运算符重载;7.1 重载运算符的目的;函数式的表达方法;运算符函数;void f( ) { Complex a(1, 3.1) ; Complex b(1.2, 2) ; Complex c = b; a = b+c; b = b+c*a; c = a*b ; };7.2 运算符重载语法;运算符函数的一般格式;运算符重载的限制;运算符重载的限制（续）;7.3 成员运算符函数;成员运算符函数;#includeiostream.h class Complex //复数类声明 { public: //外部接口 Complex(double r=0.0,double i=0.0)  {real=r;imag=i;} //构造函数 Complex operator + (Complex c2); //+重载为成员函数 Complex operator - (Complex c2); //-重载为成员函数 void display( ); //输出复数 private: //私有数据成员 double real; //复数实部 double imag; //复数虚部 }; ;//重载运算符函数的实现 Complex Complex::operator +(Complex c2) { Complex c; c.real = real + c2.real; c.imag = imag + c2.imag; return c; };//重载运算符 - 函数实现 Complex Complex::operator - (Complex c2) { Complex c; c.real=real-c2.real; c.imag=imag-c2.imag; return c; };void Complex::display( ) { cout(real,imag)endl; } int main() //主函数 { Complex c1(5,4),c2(2,10),c3; //定义复数类的对象 coutc1=; c1.display(); coutc2=; c2.display(); c3=c1-c2; //使用重载运算符完成复数减法 coutc3=c1-c2=; c3.display(); c3=c1+c2; //使用重载运算符完成复数加法 coutc3=c1+c2=; c3.display( ); return 0; };程序输出的结果为： c1=(5,4) c2=(2,10) c3=c1-c2=(3,-6) c3=c1+c2=(7,14) ;7.4 友元运算符函数;友元运算符函数;#includeiostream.h class Complex //复数类声明 { public: //外部接口 Complex(double r=0.0,double i=0.0) { real=r; imag=i; } //构造函数 friend Complex operator + (Complex c1,Complex c2); //运算符+重载为友元函数 friend Complex operator - (Complex c1,Complex c2); //运算符-重载为友元函数 void display(); //显示复数的值 private: //私有数据成员 double real; double imag; }; ;Complex operator +(Complex c1,Complex c2){ Complex c; c.real = c1.real + c2.real; c.imag = c1.imag + c2.imag; return c; } Complex operator -(Complex c1,Complex c2) { Complex c; c.real = c1.real - c2.real; c.imag = c1.imag - c2.imag; return c; } // 其它部分同上例;int main() //主函数 { Complex c1(5,4),c2(2,10),c3; //定义复数类的对象 coutc1=; c1.display(); coutc2=; c2.displa