class student{
public String name;
public int id;
public String adress;
public student (String a,int b,String c){
name = a;
id = b;
adress = c;
}
public double marks_avg(double a,double b)
{
return (a+b)/2;
}
}
class show{
public static void main(String[] args){
student s1 = new...