3-6.txt

思路很清晰的c++课件。例子很简明

#include <iostream.h>
#include <math.h>

class complex{
private:
	double real;
	double imag;
public:
	complex(double r,double i)	//构造函数
	{	real=r; imag=i;  }

	double abscomplex()
	{	double t;
	  	t=real*real+imag*imag;
	  	return sqrt(t);
	}
};

void main()
{	complex A(1.1,2.2);	//定义类的对象A时调用构造函数complex
	cout<<" abs of complex A="<<A.abscomplex()<<endl;
}