Perimeter of Circle In Java

//Following will help you understand

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

    {  float x;
    Scanner input=new Scanner(System.in);
        System.out.println("Enter the radius of circle");
        x=input.nextFloat();
        float y;
                y=2*3.142f*x;      //because of float we have used f
                System.out.printf("Perimeter of Circle %f\n",y);
    }
}

Output:

Interface in java !!

//This program helps you to understand the working of an interface



import java.util.Scanner; //package for scanning purpose
public class Purchase
{
int num,x;
Scanner obj=  new Scanner (System.in);
public void getinfo()
{
System.out.println("Enter the amount of packets purchased: ");
num=obj.nextInt();
System.out.println("Enter amount of defective packets: ");
x=obj.nextInt();

}

public static void main(String[] args)
{
result obj1=new result();
obj1.getinfo();
obj1.amtleft();
stock obj2=new result();
obj2.stk();
obj1.rslt();
}
}
class Preturn extends Purchase
{
int ret;
public void amtleft()
{
System.out.println("Amount left: ");
ret=num-x;
System.out.println(ret);

}
}
interface stock
{
public void stk();
Scanner ob = new Scanner (System.in);

}
class result extends Preturn implements stock
{
int y;

public void stk()
{
System.out.println("Enter previous stock if any: ");


}
public void rslt()
{
y= ob.nextInt();
System.out.println("Packets to be sold : "+(y+ret));
}



}

Print a String In Reverse Order

Program To Print a String In Reverse Order :

import java.util.Scanner;

public class Gndec
{

    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        String name,rev="";
        System.out.println("Enter Your Name");
       
        name=input.nextLine();
        
        System.out.printf("Hello,%s\nIn reverse Order :",name);
        
        int j=0,n=name.length();
        
        for(int i=n-1;i>=0;i--)
        {
           rev=rev+name.charAt(i);
        }
       
        System.out.println(rev);
     
}
}

Output:

Power of 2

Program to Check Whether a Number is Some Power Of 2 (Two):

import java.util.Scanner;

public class Gndec
{

    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        int a,p=0,c=0;
        System.out.println("Enter any Number");
        a=input.nextInt();
        while(a!=1)
        {if(a%2!=0)
        {   p=1;
            System.out.println("No");
            break;
        }
        else{
            a=a/2;
        }
        c++;}
        if(p==0)
        {
            System.out.println("Yes "+c);
        }
}
}

Output:

HTML Paragraph and New Line Tag

For paragraph HTML has a paragraph tag which is as per given below

<p>any description.....</p>

Following will help you Understand :
<h1>Programming</h1>
<p>"We want every kid in the world to be excited about the many possibilities coding can unlock-for themselves,for their communities and for society.Everyone should have the opportunity to learn computer science at school and beyond".</p>

Output:

Programming

"We want every kid in the world to be excited about the many possibilites coding can unlock-for themselves,for their communities and for society.Everyone should have the opportunity to learn computer science at school and beyond".

For new line HTML has a tag <br>

<br>

This tag has no closing tag.

Following will help you understand:

Gndec Programming<br>
Gndec Programming<br>
Gndec Programming

Output:

Gndec Programming
Gndec Programming
Gndec Programming

HTML Heading tag

There are six tags which are used for heading
that is h1,h2,h3,h4,h5,h6  all leads to heading but different size

Following will help you understand :

Tag	Desciption
h1	Gndec Programming
h2	Gndec Programming
h3	Gndec Programming
h4	Gndec Programming
h5	Gndec Programming
h6	Gndec Programming

HTML Basics

HTML-Hyper Text Markup Language

Basically HTML is used for webpage designing.It has many attributes,tags etc. which helps in designing of web pages

Below Given is a basic HTML Structure
<head>
</head>
<body>
<h1>My First Webpage</h1>
<p>HTML</p>
</body>

head	Used for describing head of a web page
body	Used for describing body of a web page
h1	Used for heading (1 to 6 there are headings and these are in descending size)
p	Used for paragraph

You can create your own webpage using any editor say Notepad 

Just write the code in Notepad and save it using .html or .htm extension

Then open the file in any web browser to see what is output

Output: