Java program 



1) Average of 3 numbers


package Hw;
import java.util.Scanner;
public class average {
  public static void main(String[] args) {
  int a,b,c;
   Scanner sc=new Scanner(System.in);
  System.out.println("Enter a,b & c values:");
   a=sc.nextInt();
   b=sc.nextInt();
   c=sc.nextInt();
  double avg=(a+b+c)/3.0;
  System.out.println("Average of no. is: "+avg);
   sc.close();
  }
  }


2) Area of circle


 package bbg;

import java.util.Scanner;

public class area {

  public static void main(String[] args) {
   System.out.println("Enter radius:");
   Scanner sc=new Scanner (System.in);
   double r=sc.nextDouble();
   double area= 3.14 * r * r;
   System.out.println("Area: "+area);
  
  }
}

3) Student details 

package bbg;

import  java.util.Scanner;
public class student {
  public static void main(String[] args) {


   System.out.println("Enter name: ");

   Scanner sc=new Scanner(System.in);

String name =sc.next();

  System.out.println("Enter age: ");

  int age=sc.nextInt();

System.out.println("Enter marks of COA,DM, OS");
   int coa,dm, os;
   coa=sc.nextInt();
   dm=sc.nextInt();
   os=sc.nextInt();
   double perc=(coa+dm+os)/3.0;
   System.out.println("Name: "+name+"Age "+age+" COA: " +coa+" DM: "+dm+" OS: "+os+"Percentage :"+perc);
sc.close();

  }
}