Java program to print Area of circle

import java.io.*;
import java.util.*;
class Areaofcircle
{
public static void main (String[ ]args)
{
double pi;
double area,r;
Scanner sc= new Scanner(System.in);
System.out.println("Enter pi value");
pi=sc.nextDouble();
System.out.println ("Enter r value");
r=sc.nextDouble();
area=pi*r*r;
System.out.println ("area of circle is:"+" "+area);
}
}

Java program to add Two integers

import java.io.*;
import java.util.*;
class Addition
{
public static void main (String[ ]args)
{
int a,b, c;
Scanner sc= new Scanner(System.in);
System.out.println ("Enter a,b values");
a= sc.nextInt();
b= sc.nextInt();
c=a+b;
System.out.println ("The addition of two given integers is:"+" "+c);
}
}

Java program to print a character of your name

import java.io.*;
import java.util.*;
class Desiredcharacter
{
public static void main (String[ ]args)
{
Scanner sc= new Scanner(System.in);
String name= sc.nextLine();
System.out.println ("Enter your name");
System.out.println("The desired letter of your name is:"+" "+name.charAt (0));
}
}

Explanation:- This program is to print desired character of your name by giving an integer in parenthesis at name.charAt() the desired letter of your name is printed and that is the output of the program

For example I've given Abdulkalam as name and name.charAt (4) in program then the 5th letter of the name that is letter (l) is printed

Java program to print your name

import java.io.*;
import java.util.*;
class Name
{
public static void main (String[ ]args)
{
Scanner sc= new Scanner(System.in);
String name= sc.nextLine ();
System.out.println ("Enter your name:");
System.out.println ("My name is"+"  "+name);
}
}