Write a program in JAVA which: Asks the user to enter a positive integer greater

Question

Write a program in JAVA which:

Asks the user to enter a positive integer greater than 0

Validates that the entry is a positive integer

Outputs the digits in reverse order with a space separating the digits

Outputs the even digits not in reverse order with a space separating the digits (consider zero to be even)

Outputs the odd digits not in reverse order with a space separating the digits

Allows user is to repeat/continue the program as many times as he/she wants

Keeps a record in a txt file named outDataFile.txt with the history of all numbers entered and the associated results, in the following format:

the original number is 1023

the number reversed 3 2 0 1

the even digits are 0 2

the odd digits are 1 3

-----------------

the original number is 102030

the number reversed 0 3 0 2 0 1

the even digits are 0 2 0 0

the odd digits are 1 3

-----------------

SPECIFIC REQUIREMENTS

The program must have the following four void methods:

validate //validate user input

reverse // output reverse digits to screen and txt file

even //output even digits to screen and txt file

odd //output odd digits to screen and txt file

Explanation / Answer

JAVA CODE :

import java.util.*;
import java.lang.*;
import java.io.*;

class Prog1
{
public static void main (String[] args) throws java.lang.Exception
{
Scanner reader = new Scanner(System.in); // Reading from System.in
System.out.println("Enter a number: ");
int n = reader.nextInt(); // Scans the next token of the input as an int.
List<Integer> e = new ArrayList<Integer>();
List<Integer> o = new ArrayList<Integer>();

//validating whether input is postive or not
if(n>0){
//printing the digits in reverse order
int temp=n;
System.out.println("The digits in reverse order ");
while(temp!=0){
int x=temp%10;
temp=temp/10;
if(x%2==0){
e.add(x);
}
else{
o.add(x);
}
System.out.print(x+" ");
}
System.out.println();
System.out.println("EVEN DIGITS");
for(int i=0;i<e.size();i++){
System.out.print(e.get(i)+" ");
}
System.out.println();
System.out.println("ODD DIGITS");
for(int i=0;i<o.size();i++){
System.out.print(o.get(i)+" ");
}
}
else
{
System.out.println("THE INPUT IS NOT POSITIVE...PLEase try again");
}
}
}

output :

Enter a number: 102030
The digits in reverse order
0 3 0 2 0 1
EVEN DIGITS
0 0 2 0
ODD DIGITS
3 1

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