Question

Can anyone tell me why the program is failing to execute in the third part i.e. when i m passing copy constructor?
It says that the identifier expected near Stud(studs)

class Stud
{
String name;
int rollno;
double per;

Stud()
 {
  name="";
  rollno=0;
  per=0.0;
 }

Stud(String n,int rn,double p)
 {
  name=n;
  rollno=rn;
  per=p;
 }

Stud(Studs)
 {
  name=s.name;
  rollno=s.rollno;
  per=s.per;
 }


void display()
{
 System.out.println(name+ "\t" +rollno+ "\t" +per);
}
}

class StudApp14
 {
  public static void main(String a[])
   {
    Stud s1=new Stud();
    Stud s2=new Stud("Amit",501,65.0);
    Stud s3=new Stud(s2);
    s1.display();
    s2.display();
    s3.display();
   }
 }

Answer 1

Stud(Studs)
{
name=s.name;
rollno=s.rollno;
per=s.per;
}
What is “Studs”? there is no definition for it.

Maybe you meant

Stud (Stud s ) {}