Question

DO NOT USE ANY EXTERNAL LIBRARIES BESIDES BUILT IN JAVA LIBRARIES! KEEP IT SIMPLE!!!

Provided Code:

13.7 Single & Double Digit Numbers Pt. 1: Write a Java program that takes any quantity of a number between 0 and 99 and creates a String of numbers from 0 to n(inclusive) Example: n=5 should generate this String "012345" Note: This program should check that n < 100 AND that n >= 0. Pt. 2: Next, utilizing the information within the String just created in Pt.1 (012345"), generate separate strings for each of the following specifications. Odd numbers: Should generate a new String containing ONLY odd numbers --> "135" Even numbers: Should generate a new String containing ONLY even numbers --> "024" Note: You will be handling two different types of numbers: 1 digit (EX: 1 2 3 4 5 6 7 8 9) numbers and 2 digit (EX: 10 11 1213 14.9) numbers.

import java.util.Scanner;

public class OddAndEven{

/* PART 1: Create a nonstatic method that takes in an int number quantity (n) and returns a returns a
String of numbers from 0 to n (inclusive) as the example above demonstrates. Call this quantityToString.
  
In this method you should check that n is between 0(inclusive) and 100(inclusive).
If n is outside these boundaries return and empty String ("").
*/


//*****Student Code Here*****//


/* PART 2: Next, you will implement oddAndEvenNumbers method that generates two string's (odd and even) and
then prints the results at the end.
  
-A String which holds Odd Numbers
-A String which holds Even Numbers

Use if statements to check whether numInfo is less than 11, is numInfo is less than 11 then it only contains single digit numbers.
else: if numInfo is greater than 11 then it has both single digits and double digits.
Single and double digit nummbers must be checked for different.

single digit numbers: can be checked at an index since single digit numbers are only 1 digit long.
double digit numbers: have to be checked as a double digit numbers, therefore, when fetching a double digit number at an index, you have to fetch the preceeding index as well because it is 2 digits long and 2 indexes long. (Substring())

Use two loops, one loop will be for single digit numbers (0 -9)
and the other will be for double digit numbers. (10 - 99)
  
*/
  
public void oddAndEvenNumbers(int num) {//Start of method
//Variables
String numInfo = ""; //reassign to the String that quantityToString returns
String odd = "";
String even = "";

//*****Student Code Here*****//


//Prints the results *Do not need to change this part*
System.out.println("Odd Numbers: " + odd);
System.out.println("Even Numbers: " + even);

}//End of method
  
public static void main(String[] args) {

//Testing -- Uncommented when done//

/*
OddAndEven obj = new OddAndEven();
System.out.println("Testing n = 5");
obj.oddAndEvenNumbers(5);
System.out.println("Testing n = 10");
obj.oddAndEvenNumbers(10);
System.out.println("Testing n = 15");
obj.oddAndEvenNumbers(15);
System.out.println("Testing n = 99");
obj.oddAndEvenNumbers(99);
*/
  
  
}
}

Answer 1

Code:

import java.util.Scanner;
class OddAndEven{
   String quantifyToString(int n){
       if(n<0 || n>100){
           return "";
       }
       else{
           String s="";
           int i;
           for(i=0;i<=n;i++){
               s=s+Integer.toString(i);
           }
           return s;
       }
   }
   public void oddAndEvenNumbers(int num){
       String numinfo=quantifyToString(num);
       String odd="";
       String even="";
       int i,j;
       if(numinfo.length()<11){
           for(i=0;i<numinfo.length();i++){
               String s=numinfo.substring(i,i+1);
               j=Integer.parseInt(s);
               if(j%2==0){
                   even=even+s;
               }
               else{
                   odd=odd+s;
               }
           }
       }
       else{
           for(i=0;i<10;i++){
               String s=numinfo.substring(i,i+1);
               j=Integer.parseInt(s);
               if(j%2==0){
                   even=even+s;
               }
               else{
                   odd=odd+s;
               }
           }
           while(i<numinfo.length()){
               String s=numinfo.substring(i,i+1);
               j=Integer.parseInt(s);
               i++;
               String s1=numinfo.substring(i,i+1);
               i++;
               int k=Integer.parseInt(s1);
               j=j*10+k;
               if(j%2==0){
                   even=even+s+s1;
               }
               else{
                   odd=odd+s+s1;
               }
              
           }
              
       }
       System.out.println("Odd Numbers: " + odd);
       System.out.println("Even Numbers: " + even);
      
   }
   public static void main(String args[]){
       Scanner s=new Scanner(System.in);
       System.out.print("Enter n:");
       int n=s.nextInt();
       OddAndEven obj=new OddAndEven();
       obj.oddAndEvenNumbers(n);
   }

}

Output:

Enter n:12 Odd Numbers: 1357911 Even Numbers: 024681012