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Third program

interface calculate_result {  public void calculate_total();  public void calculate_percentage();  public void calculate_grade(); } class student implements calculate_result {  int m1,m2,m3,tot=0;  float per=0f;  void get_marks(int ma1,int ma2,int ma3)  {   m1=ma1;   m2=ma2;   m3=ma3;  }  public void calculate_total()  {   tot=m1+m2+m3;   System.out.println("Total marks: "+tot);  }  public void calculate_percentage()  {   per=tot/3;   System.out.println("Percentage :"+per);  }  public void calculate_grade()  {   if(per>75)    System.out.println("Grade A");   else if(per<75 & per>55)    System.out.println("Grade B");   else if(per<55 & per>35)    System.out.println("Grade C");   else    System.out.println("Fail");  }  public static void main(String args[])  {   student c= new student();   c.get_marks(78,89,56);   c.calculate_total();   c.calculate_percentage();
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Second Program

class voter {  String voter_name,voter_address;  int votercontactno,voteradhar;  voter(String vn, String va,int vcn,int vad)  {   voter_name=vn;   voter_address=va;   votercontactno=vcn;   voteradhar=vad;  }  void display()  {    System.out.println("Voter Name: "+voter_name);    System.out.println("Voter Address: "+voter_address);    System.out.println("Voter Contact Number: "+votercontactno);    System.out.println("Voter Adhar: "+voteradhar);  }  public static void main(String args[])  {   voter v[]=new voter[5];   v[0]=new voter("Rahul","Nashik",21458,14785238);   v[1]=new voter("Nitesh","Pune",25742,36985254);   v[2]=new voter("Ranjish","Nagpur",58741,12543658);   v[3]=new voter("Pranav","Mumbai",45875,24596587);   v[4]=new voter("Nikhil","Gangapur",45896,27412563);   for(int i=0;i<5;i++)   {    v[i].display()
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first program

import java.io.*; abstract class staff {  int no;  String name;  void lint_data(int n, String na)  {   no=n;   name=na;  }  abstract void calculate_salary(); } class typist extends staff {    int speed,salary=0;    void calculate_salary(int n,String na,int s)    { super(n,na); speed=s;     if(speed<40)      salary=4000;     else      salary=5000;    }    void display()    { System.out.println("Name: "+name); System.out.println("NO: "+no); System.out.println("Speed is: "+speed); System.out.println("Salary is: "+salary);    }  }  class capable  {  public static void main(String args[])throws IOException  {  typist t=new typist();  t.calculate_salary(1,"Atul",32);  t.display();  }  }
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