Function

  class demo
  {
    public static void main(String args[])
    {
      int z=area(5,7)+area(3,4)+area(6,8);
      System.out.println("Total area is "+z);
    }
    static int area(int L,int B)
    {
      int a=L*B;
      return a ;
    }
  }
  

  class demo
  {
    public static void main(String args[])
    {
      int z=volume(5,4,7)+volume(8,7,3) ;
      System.out.println("Total volume is"+z);
    }
    static int volume(int L,int B,int H)
    {
      int v=L*B*H;
      return v;
    }
  }
  

  class demo
  {
    public static void main(String args[])
    {
      double z=interest(5000,10.25,3);
      System.out.println("Simple interest is"+z);
    }
    static double interest(int P,double R,int N)
    {
      double si=P*R*N/100.0;
      return si;
    }
  }
  

  class demo
  {
    public static void main(String args[])
    {
      double z = volume( 5.6 );
      System.out.println("Volume of sphere is"+z);
    }
    static double volume(double R)
    {
      double v=4/3.0*3.14*R*R*R;
      return v ;
    }
  }
  

  class demo
  {
    public static void main(String args[])
    {
      int z=sum(10);
      System.out.println("sum is "+z);
    }
    static int sum(int n)
    {
      int s=0;
      for(int i=1;i<=n; i++)
        s=s+i;
      return s ;
    }
  }
  

  class demo
  {
    public static void main(String args[])
    {
      Scanner stdin=new Scanner(System.in);
      System.out.println("Enter Radius:");
      double n = stdin.nextDouble();
      double p= area(n);
      double q = circumference(n);
      System.out.println("Area is "+p+"\nCircumference is"+q);
    }
    static double area(double R)
    {
      double a = 3.14 * R * R ;
      return a ;
    }
    static double circumference(double R)
    {
      double c =2*3.14*R;
      return c ;
    }
  }
  

  class demo
  {
    public static void main(String args[])
    {
      int z=fact(5);
      System.out.println("Result is "+z);
    }
    static int fact(int n)
    {
      int s=1;
      for(int i=1;i<=n;i++)
        s=s*i;
      return s;
    }
  }