Anonymous user
Lucky and even lucky numbers: Difference between revisions
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Note that I've used the J command line rather than a unix or windows command line. This is because J is portable to a wide variety of environments (including phones) and there's no reliably common command line that exists across all these environments. Therefore, J must provide its own, and J's command line requires some slight syntax changes from the suggestions implicit in this task.
=={{header|Java}}==
<lang Java>
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class LuckyNumbers {
private static int MAX = 200000;
private static List<Integer> luckyEven = luckyNumbers(MAX, true);
private static List<Integer> luckyOdd = luckyNumbers(MAX, false);
public static void main(String[] args) {
// Case 1 and 2
if ( args.length == 1 || ( args.length == 2 && args[1].compareTo("lucky") == 0 ) ) {
int n = Integer.parseInt(args[0]);
System.out.printf("LuckyNumber(%d) = %d%n", n, luckyOdd.get(n-1));
}
// Case 3
else if ( args.length == 2 && args[1].compareTo("evenLucky") == 0 ) {
int n = Integer.parseInt(args[0]);
System.out.printf("EvenLuckyNumber(%d) = %d%n", n, luckyEven.get(n-1));
}
// Case 4 through 9
else if ( args.length == 2 || args.length == 3 ) {
int j = Integer.parseInt(args[0]);
int k = Integer.parseInt(args[1]);
// Case 4 and 5
if ( ( args.length == 2 && k > 0 ) || (args.length == 3 && k > 0 && args[2].compareTo("lucky") == 0 ) ) {
System.out.printf("LuckyNumber(%d) through LuckyNumber(%d) = %s%n", j, k, luckyOdd.subList(j-1, k));
}
// Case 6
else if ( args.length == 3 && k > 0 && args[2].compareTo("evenLucky") == 0 ) {
System.out.printf("EvenLuckyNumber(%d) through EvenLuckyNumber(%d) = %s%n", j, k, luckyEven.subList(j-1, k));
}
// Case 7 and 8
else if ( ( args.length == 2 && k < 0 ) || (args.length == 3 && k < 0 && args[2].compareTo("lucky") == 0 ) ) {
int n = Collections.binarySearch(luckyOdd, j);
int m = Collections.binarySearch(luckyOdd, -k);
System.out.printf("Lucky Numbers in the range %d to %d inclusive = %s%n", j, -k, luckyOdd.subList(n < 0 ? -n-1 : n, m < 0 ? -m-1 : m+1));
}
// Case 9
else if ( args.length == 3 && k < 0 && args[2].compareTo("evenLucky") == 0 ) {
int n = Collections.binarySearch(luckyEven, j);
int m = Collections.binarySearch(luckyEven, -k);
System.out.printf("Even Lucky Numbers in the range %d to %d inclusive = %s%n", j, -k, luckyEven.subList(n < 0 ? -n-1 : n, m < 0 ? -m-1 : m+1));
}
}
}
private static List<Integer> luckyNumbers(int max, boolean even) {
List<Integer> luckyList = new ArrayList<>();
for ( int i = even ? 2 : 1 ; i <= max ; i += 2 ) {
luckyList.add(i);
}
int start = 1;
boolean removed = true;
while ( removed ) {
removed = false;
int increment = luckyList.get(start);
List<Integer> remove = new ArrayList<>();
for ( int i = increment-1 ; i < luckyList.size() ; i += increment ) {
remove.add(0, i);
removed = true;
}
for ( int i : remove ) {
luckyList.remove(i);
}
start++;
}
return luckyList;
}
}
</lang>
{{out}}
<pre>
C:\My_Data\software\EclipseOxygenProjects\Rosetta Code\bin>java LuckyNumbers 1 20
LuckyNumber(1) through LuckyNumber(20) = [1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79]
C:\My_Data\software\EclipseOxygenProjects\Rosetta Code\bin>java LuckyNumbers 1 20 evenLucky
EvenLuckyNumber(1) through EvenLuckyNumber(20) = [2, 4, 6, 10, 12, 18, 20, 22, 26, 34, 36, 42, 44, 50, 52, 54, 58, 68, 70, 76]
C:\My_Data\software\EclipseOxygenProjects\Rosetta Code\bin>java LuckyNumbers 6000 -6100
Lucky Numbers in the range 6000 to 6100 inclusive = [6009, 6019, 6031, 6049, 6055, 6061, 6079, 6093]
C:\My_Data\software\EclipseOxygenProjects\Rosetta Code\bin>java LuckyNumbers 6000 -6100 evenLucky
Even Lucky Numbers in the range 6000 to 6100 inclusive = [6018, 6020, 6022, 6026, 6036, 6038, 6050, 6058, 6074, 6090, 6092]
C:\My_Data\software\EclipseOxygenProjects\Rosetta Code\bin>java LuckyNumbers 10000
LuckyNumber(10000) = 115591
C:\My_Data\software\EclipseOxygenProjects\Rosetta Code\bin>java LuckyNumbers 10000 evenLucky
EvenLuckyNumber(10000) = 111842
</pre>
=={{header|Julia}}==
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