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  1.  
  2. #include <stdio.h>
  3.  
  4. /*
  5.  * Irish License Plate Validator (2013–2024)
  6.  * Returns 1 if valid, 0 if invalid.
  7.  *
  8.  * Rules:
  9.  *  - year: 13..24
  10.  *  - halfYear: 1 or 2
  11.  *  - county: C/D/G/L/T/W (upper or lower)
  12.  *  - sequence: 1..999999 (1 to 6 digits, no leading zeros implied by integer)
  13.  */
  14. int irishLicensePlateValidator(int year, int halfYear, char county, int sequence)
  15. {
  16.     if (year < 13 || year > 24)
  17.         return 0;
  18.  
  19.     if (halfYear != 1 && halfYear != 2)
  20.         return 0;
  21.  
  22.     switch (county)
  23.     {
  24.         case 'C': case 'c':
  25.         case 'D': case 'd':
  26.         case 'G': case 'g':
  27.         case 'L': case 'l':
  28.         case 'T': case 't':
  29.         case 'W': case 'w':
  30.             break;          /* valid county */
  31.         default:
  32.             return 0;       /* invalid county */
  33.     }
  34.  
  35.     if (sequence < 1 || sequence > 999999)
  36.         return 0;
  37.  
  38.     return 1;
  39. }
  40.  
  41. int main(void)
  42. {
  43.     int retVal;
  44.  
  45.     /* Valid example from prompt */
  46.     retVal = irishLicensePlateValidator(13, 1, 'D', 21);
  47.     printf("Test 1: (13, 1, 'D', 21) -> %s\n", retVal ? "VALID" : "INVALID");
  48.  
  49.     /* Invalid example: bad half year and county */
  50.     retVal = irishLicensePlateValidator(13, 3, 'K', 1);
  51.     printf("Test 2: (13, 3, 'K', 1)  -> %s\n", retVal ? "VALID" : "INVALID");
  52.  
  53.     /* Invalid example: sequence too large */
  54.     retVal = irishLicensePlateValidator(24, 1, 'C', 1245891);
  55.     printf("Test 3: (24, 1, 'C', 1245891) -> %s\n", retVal ? "VALID" : "INVALID");
  56.  
  57.     /* A couple extra quick checks */
  58.     retVal = irishLicensePlateValidator(14, 2, 'g', 999999);
  59.     printf("Test 4: (14, 2, 'g', 999999) -> %s\n", retVal ? "VALID" : "INVALID");
  60.  
  61.     retVal = irishLicensePlateValidator(12, 1, 'D', 21);
  62.     printf("Test 5: (12, 1, 'D', 21) -> %s\n", retVal ? "VALID" : "INVALID");
  63.  
  64.     return 0;
  65. }
  66.  
Success #stdin #stdout 0s 5276KB
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Standard input is empty
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Test 1: (13, 1, 'D', 21) -> VALID
Test 2: (13, 3, 'K', 1)  -> INVALID
Test 3: (24, 1, 'C', 1245891) -> INVALID
Test 4: (14, 2, 'g', 999999) -> VALID
Test 5: (12, 1, 'D', 21) -> INVALID
https://ideone.com/I7199j
language:
C (gcc 8.3)
created:
12 hours ago
visibility:
public

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