Answer:
import java.util.Scanner; // package import
public class Main // main class
{
public void phone() //function definition
{
Scanner ob = new Scanner(System.in);// scanner class
String phno = " ";
System.out.println("Enter 10-digit of Us telephone number: ");
phno = ob.next();
if(phno.length() != 10) // checking the length of phone number
{
System.out.println("Enter a valid 10-digit number..."); // print error message
}
else
{
System.out.println("The phone number you entered: "+phno);
String a = phno .substring(0,3); // calculate the area code
String exh = phno.substring(3,6);//calculate the exchange code
String num1 = phno.substring(6,10);//calculate the phone number
System.out.println("Area code is :"+a);// display area code
System.out.println("Exchange is: "+exh);// display exchange code
System.out.println("Number is: "+num1);//display phone number
System.out.println("The complete telephone number : ("+a+") "+exh+"-"+num1);// DISPLAY COMPPLETE NUMBER
}
}
public static void main(String[] args) // MAIN METHOD
{
Main ob =new Main(); // CREATING an object of class Main
ob.phone();// calling function phone method
}
}
Explanation:
In the given program we create a function phone of void return type and input a phone number in "phno " variable by using scanner class object After that check the length of phone number by using length() method if length is 10 then we extracts the area code ,exchange code and remaining number by using substring method which is used to extract the character from string and finally display the complete telephone number in proper formatting. If length does not equal to 10 it print error message .
Output:
Enter 10-digit of Us telephone number:1234567890
The phone number you entered:1234567890
Area code is :123
Exchange is:456
Number is:7890
The complete telephone number : (123) 456-7890