class Father
{
int age;
String name;
void eat()
{
System.out.println("吃饃！");
}
}
class Son extends Father
{
int height;
void eat()
{
super.eat();
System.out.println("喝酒");
}
}
class Ex
{
public static void main(String args[])
{
Son p=new Son();
Father p1=new Son();
p1.eat();
p.eat();
}
}
class Complex{
double real;
double image;
public Complex add(Complex another){
Complex res = new Complex();
res.real = real + another.real;
res.image = image + another.image;
return res;
}
public Complex minus(Complex another){// 當前復數與方法參數another相減；
Complex r = new Complex();
r.real = real - another.real;
r.image = image - another.image;
return r;
}
public Complex multi(Complex another){ //當前復數與方法參數another相乘（注意復數相乘）；
Complex r = new Complex();
r.real = real * another.real - image * another.image;
r.image = real * another.image + image * another.real ;
return r;
}
public void disp(){
if( image == 0 ){
System.out.print(real);
}
else
{
System.out.print(real + " + " + image + "i");
}
}
public Complex(double real , double image){
this.real = real;
this.image = image ;
}
public Complex(){
this(0 , 0);
}
public static void main (String[] args) {
Complex c1 = new Complex(2 , 3);
Complex c2 = new Complex(5 , 4);
Complex res;
c1.disp();
System.out.print(" + ");
c2.disp();
System.out.print(" = ");
c1.add(c2).disp();
System.out.println();
c1.disp();
System.out.print(" - ");
c2.disp();
System.out.print(" = ");
c1.minus(c2).disp();
System.out.println();
c1.disp();
System.out.print(" * ");
c2.disp();
System.out.print(" = ");
c1.multi(c2).disp();
System.out.println();
}
}