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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. // Function to return the blackjack value of two cards
  5. int blackjack_score(char card1, char card2) {
  6.     int value1 = 0, value2 = 0;
  7.  
  8.  
  9.     card1 = toupper(card1);
  10.     card2 = toupper(card2);
  11.  
  12.     // Helper function using a switch-case
  13.     int get_card_value(char card) {
  14.         switch (card) {
  15.             case '2': return 2;
  16.             case '3': return 3;
  17.             case '4': return 4;
  18.             case '5': return 5;
  19.             case '6': return 6;
  20.             case '7': return 7;
  21.             case '8': return 8;
  22.             case '9': return 9;
  23.             case 'T': case 'J': case 'Q': case 'K': return 10;
  24.             case 'A': return 11; // default as 11, may adjust later
  25.             default: return -1;  // invalid card
  26.         }
  27.     }
  28.  
  29.     value1 = get_card_value(card1);
  30.     value2 = get_card_value(card2);
  31.  
  32.     // Check for invalid input
  33.     if (value1 == -1 || value2 == -1) {
  34.         printf("*** Invalid input: '%c' and/or '%c' are not valid cards.\n", card1, card2);
  35.         return -1;
  36.     }
  37.  
  38.     // Adjust for double Aces
  39.     if (card1 == 'A' && card2 == 'A') {
  40.         return 11 + 1;  // First ace is 11, second is 1
  41.     }
  42.  
  43.     // Adjust one ace to 11 if present
  44.     if (card1 == 'A' || card2 == 'A') {
  45.         return (value1 + value2);  // only one Ace: counts as 11
  46.     }
  47.  
  48.     return value1 + value2;
  49. }
  50.  
  51. int main() {
  52.     char card1, card2;
  53.     printf("Enter cards: ");
  54.     scanf(" %c %c", &card1, &card2);
  55.  
  56.     int score = blackjack_score(card1, card2);
  57.  
  58.     if (score != -1) {
  59.         printf("The score is %d\n", score);
  60.     }
  61.  
  62.     return 0;
  63. }
  64.  
  65.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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Enter cards: *** Invalid input: '' and/or '' are not valid cards.
https://ideone.com/ygRMne
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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