7周任务3.类模板的使用

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#include <iostream>  using namespace std;  template <class numtype>  class Complex     {  public:  Complex( ){real=0;imag=0;} Complex(double r,double i){real=r;imag=i;} Complex complex_add(Complex &c2); //   复数相加函数  Complex complex_subtract(Complex <numtype> &c2);  // 复数相减函数  Complex complex_multiply(Complex <numtype> &c2); //   复数相乘函数Complex complex_divide(Complex <numtype> &c2);    //   相除函数void display( );     //private:  double real;   double imag;   };  template <class numtype>  Complex<numtype> Complex<numtype>::complex_add(Complex <numtype> &c2)  //复数相加函数{  Complex <numtype> c;  c.real=real+c2.real;  c.imag=imag+c2.imag;  return c;  }   template <class numtype>  Complex<numtype> Complex<numtype>::complex_subtract(Complex <numtype> &c2)  //  复数相减函数{  Complex <numtype> c;  c.real=real-c2.real;  c.imag=imag-c2.imag;  return c;  }  template <class numtype>  Complex<numtype> Complex<numtype>::complex_multiply(Complex <numtype> &c2)  // 复数相乘函数 {  Complex <numtype> c;  c.real=real*c2.real-imag*c2.imag;  c.imag=imag*c2.real+real*c2.imag;  return c;  }  template <class numtype>  Complex<numtype> Complex<numtype>::complex_divide(Complex <numtype> &c2)  //复数相除函数 {  Complex <numtype> c;  c.real=(real*c2.real+c2.imag*imag)/(real*real+imag*imag);  c.imag=(c2.imag*real-c2.real*imag)/(real*real+imag*imag);  return c;  }   template <class numtype>  void Complex<numtype>::display( )   //输出复数函数  {  cout<<"("<<real<<","<<imag<<"i)"<<endl;  }  int main( )  {     Complex<int> c1(3,4),c2(5,-10),c3;    c3=c1.complex_add(c2);    cout<<"c1+c2=";   c3.display( );  c3=c1.complex_subtract(c2) ;  cout<<"c1-c2=";   c3.display( );  c3=c1.complex_multiply(c2);    cout<<"c1*c2=";   c3.display( );  c3=c1.complex_divide(c2);   cout<<"c2/c1=";   c3.display( );  Complex<double>   c4(3.1,4.4),c5(5.34,-10.21),c6;  c6=c4.complex_add(c5);    cout<<"c4+c5=";   c6.display( );  c6=c4.complex_subtract(c5) ;  cout<<"c4-c5=";   c6.display( );  c6=c4.complex_multiply(c5);    cout<<"c4*c5=";   c6.display( );  c6=c4.complex_divide(c5) ;  cout<<"c5/c4=";   c6.display( );  system("pause");  return 0;  }

运行结果：

感言：利用类模板，增强了类程序的使用性。。。增多了数据类的定义，更方便。。。