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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.     private static final char[] DIGITS = ("0123456789"
  11.            + "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  12.            + "abcdefghijklmnopqrstuvwxyz").toCharArray();
  13.     private static final int BASE = DIGITS.length;
  14.     private static final int MAX_NUMBER = BASE * BASE * BASE;
  15.  
  16.     public static String generateCode(int num) {
  17.         if (num < 1 || num > MAX_NUMBER) {
  18.             throw new IllegalArgumentException("Illegal input value: " + num);
  19.         }
  20.  
  21.         int value = num - 1;
  22.  
  23.         char ac = DIGITS[((value / BASE) / BASE) % BASE];
  24.         char bc = DIGITS[(value / BASE) % BASE];
  25.         char cc = DIGITS[value % BASE];
  26.         return new String(new char[]{ac, bc, cc});
  27.     }
  28.  
  29.     public static void testIt(int value) {
  30.     	try {
  31.     		System.out.println("Value " + value + ": " + generateCode(value));
  32.     	} catch (Exception e) {
  33.     		System.out.println("Value " + value + " Error " + e.getMessage());
  34.     	}
  35.     }
  36.  
  37. 	public static void main (String[] args) throws java.lang.Exception
  38. 	{
  39. 		testIt(0);
  40. 		testIt(1);
  41. 		testIt(2);
  42. 		testIt(62);
  43. 		testIt(63);
  44. 		testIt(1000);
  45. 		testIt(MAX_NUMBER);
  46. 		testIt(MAX_NUMBER + 1);
  47. 	}
  48. }
Success #stdin #stdout 0.1s 27740KB
comments (?)
stdin 
Standard input is empty
stdout 
Value 0 Error Illegal input value: 0
Value 1: 000
Value 2: 001
Value 62: 00z
Value 63: 010
Value 1000: 0G7
Value 238328: zzz
Value 238329 Error Illegal input value: 238329
https://ideone.com/EZqXlJ
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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