Write a java program which: 1. Asks the user to enter a positive integer greater
ID: 3811143 • Letter: W
Question
Write a java program which:
1. Asks the user to enter a positive integer greater than 0
2. Validates that the entry is a positive integer
3. Outputs the digits in reverse order with a space separating the digits
4. Outputs the even digits not in reverse order with a space separating the digits (consider zero to be even)
5. Outputs the odd digits not in reverse order with a space separating the digits
6. Allows user is to repeat/continue the program as many times as he/she wants
7. 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
-----------------
In addition:
8. The program must have the following four void methods:
a. validate //validate user input
b. reverse // output reverse digits to screen and txt file
c. even //output even digits to screen and txt file
d. odd //output odd digits to screen and txt file
Explanation / Answer
HI, Please find my implementtion.
Please let me know in case of any issue.
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class ReverseNumber {
public static boolean validate(int n){
if(n > 0)
return true;
else
return false;
}
public static void reverse(int n, BufferedWriter bw) throws IOException{
String rev = "";
while(n > 0){
int d = n%10;
rev = rev + d + " ";
n = n/10;
}
bw.write("the number reversed "+rev);
bw.newLine();
System.out.println("the number reversed "+rev);
}
public static void odd(int n, BufferedWriter bw) throws IOException{
String odd = "";
while(n > 0){
int d = n%10;
if(d%2 == 1)
odd = d+" "+odd;
n = n/10;
}
bw.write("the odd digits are "+odd);
bw.newLine();
System.out.println("the odd digits are "+odd);
}
public static void even(int n, BufferedWriter bw) throws IOException{
String even = "";
while(n > 0){
int d = n%10;
if(d%2 == 0)
even = d+" "+even;
n = n/10;
}
System.out.println("the even digits are "+even);
bw.write("the even digits are "+even);
bw.newLine();
}
public static void main(String[] args) throws IOException {
Scanner sc = new Scanner(System.in);
System.out.print("Enter a integer: ");
int n = sc.nextInt();
while(!validate(n)){
System.out.print("Enter a integer: ");
n = sc.nextInt();
}
// opening file
FileWriter fr = new FileWriter(new File("outDataFile.txt"));
BufferedWriter bw = new BufferedWriter(fr);
System.out.println("the original number is "+n);
bw.write("the original number is "+n);
bw.newLine();
reverse(n, bw);
even(n, bw);
odd(n, bw);
bw.newLine();
bw.close();
fr.close();
}
}
/*
Sample output:
Enter a integer: -5
Enter a integer: 102030
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
*/
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