课堂测试

#include <iostream>
#include <cmath>
using namespace std;
class complex
{
	public:
	complex(double a1=0,double b1=0);
	complex(complex &x);
	void add(complex t);
	void show();
	double mod();
	private:
		double a;
		double b;
		double c;
};
complex::complex(complex &x)
{
	a=x.a;
	b=x.b;
}
complex::complex(double a1,double b1)
{
	a=a1;
	b=b1;
}
void complex::add(complex t)
{
	a=a+t.a;
	b=b+t.b;
}
void complex::show()
{
	cout<<a<<"+"<<b<<"i"<<endl;
	cout<<c<<endl;
}
double complex::mod()
{
	c=sqrt(a*a+b*b);
}
int main()
{
	complex c1(3,5);
	complex c2(4.5);
	complex c3(c1);
	c1.add(c2);
	c1.mod();
	c1.show();
	c3.show();
}