Question

在C++中定义一个复数类的题

#include#includeclasscomplex

{

double real,imag;

public:

complex(double real=0.0, doubleimag=0.0); //声明构造函数

( ) //声明析构函数

double abscomplex();

};

( ) //定义构造函数

{

cout<<"constructing……"<<endl;

real=r;

imag=i;

}

complex::~complex() //定义析构函数

{

cout<<"destructing……"<<endl;

}

doublecomplex::abscomplex()

{

double n;

n=real*real+imag*imag;

return sqrt(n);

}

voidmain()

{

( ) //定义复数类对象ob(1.1,2.2)

cout<<"absof complex ob="<< ( )<<endl; //调用abscomplex()函数

}

括号内的应该填什么呢

Answer 1

class complex
{
double real,imag;
public:
complex(double real=0.0, doubleimag=0.0); //声明构造函数
~complex( void ); //声明析构函数
double abscomplex();
};

complex::complex(double real=0.0, doubleimag=0.0) //定义构造函数
{
cout<<"constructing……"<<endl;
real=r;
imag=i;
}

complex::~complex() //定义析构函数
{
cout<<"destructing……"<<endl;
}

double complex::abscomplex()
{
double n;
n=real*real+imag*imag;
return sqrt(n);
}