Modify the program to print \"1st\", \"2nd\", \"3rd\", \"4th\" and \"5th\" rathe

Question

Modify the program to print "1st", "2nd", "3rd", "4th" and "5th" rather than "1th", "2th", etc., without introducing redundant statements (Hint: Precede the "if-else" statement with a separate if-else statement that determines the appropriate ending based on the number).

import java.util.ArrayList;
import java.util.Scanner;

public class MostPopularOS {
public static void main (String [] args) {
Scanner scnr = new Scanner(System.in);
ArrayList<String> operatingSystems = new ArrayList<String>();
int nthOS = 1; // User input, Nth most popular OS

// Source: Wikipedia.org, 2013
operatingSystems.add(new String("Windows 7"));
operatingSystems.add(new String("Windows XP"));
operatingSystems.add(new String("OS X"));
operatingSystems.add(new String("Windows Vista"));
operatingSystems.add(new String("Windows 8"));
operatingSystems.add(new String("Linux"));
operatingSystems.add(new String("Other"));

System.out.print("Enter N (1-7): ");
nthOS = scnr.nextInt();

if ((nthOS >= 1) && (nthOS <= 7)) {
System.out.print("The " + nthOS + "th most popular OS is ");
System.out.println(operatingSystems.get(nthOS - 1));
}

return;
}
}

Explanation / Answer

MostPopularOS.java

import java.util.ArrayList;
import java.util.Scanner;
public class MostPopularOS {
public static void main (String [] args) {
Scanner scnr = new Scanner(System.in);
ArrayList<String> operatingSystems = new ArrayList<String>();
int nthOS = 1; // User input, Nth most popular OS
// Source: Wikipedia.org, 2013
operatingSystems.add(new String("Windows 7"));
operatingSystems.add(new String("Windows XP"));
operatingSystems.add(new String("OS X"));
operatingSystems.add(new String("Windows Vista"));
operatingSystems.add(new String("Windows 8"));
operatingSystems.add(new String("Linux"));
operatingSystems.add(new String("Other"));
System.out.print("Enter N (1-7): ");
nthOS = scnr.nextInt();
String temp = "";
if ((nthOS >= 1) && (nthOS <= 7)) {
if(nthOS == 1){
       temp = "st";
   }
   else if(nthOS == 2){
       temp = "nd";
   }else if(nthOS == 3){
       temp = "rd";
   }else{
       temp = "th";
   }
System.out.print("The " + nthOS + temp+" most popular OS is ");
System.out.println(operatingSystems.get(nthOS - 1));
}
return;
}
}

Output:

Enter N (1-7): 5
The 5th most popular OS is Windows 8

Enter N (1-7): 2
The 2nd most popular OS is Windows XP

Enter N (1-7): 3
The 3rd most popular OS is Windows XP

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