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  1. #include <stdio.h>
  2. int blackjack_hand_value(char card1, char card2) {
  3.     /**
  4.      * Calculate the point total of a two-card blackjack hand.
  5.      *
  6.      * Parameters:
  7.      * - card1: The first card in the hand ('2'-'9', 'T', 'K', 'Q', 'J', 'A').
  8.      * - card2: The second card in the hand ('2'-'9', 'T', 'K', 'Q', 'J', 'A').
  9.      *
  10.      * Returns:
  11.      * - int: The point total of the hand.
  12.      * - -1: If invalid input is provided.
  13.      */
  14.  
  15.     // Helper function to get the value of a single card
  16.     int get_card_value(char card) {
  17. // Convert to uppercase for consistency
  18.         if (card >= '2' && card <= '9') {
  19.             return card - '0'; // Convert char '2'-'9' to integer 2-9
  20.         } else if (card == 'T' || card == 'K' || card == 'Q' || card == 'J') {
  21.             return 10; // Face cards are worth 10 points
  22.         } else if (card == 'A') {
  23.             return 11; // Aces are worth 11 points by default
  24.         } else {
  25.             return -1; // Invalid card
  26.         }
  27.     }
  28.  
  29.     // Get the values of the two cards
  30.     int value1 = get_card_value(card1);
  31.     int value2 = get_card_value(card2);
  32.     int total;
  33.  
  34.     // Check for invalid input
  35.     if (value1 == -1 || value2 == -1) 
  36.     {
  37.         return -1; // Return -1 to indicate an error
  38.     }
  39.  
  40.     // Adjust for multiple aces (if both cards are aces)
  41.     if (value1 == 'A' || 'a' && value2 == 'A' || 'a') 
  42.     {
  43.         total = 12; // One ace is worth 11, the other is worth 1
  44.     }
  45.  
  46.     // Calculate the total value of the hand
  47.     total = value1 + value2;
  48.  
  49.     return total;
  50. }
  51.  
  52. int main() {
  53.     // Example usage
  54.     char card1, card2;
  55.  
  56.     printf("Enter the first card (2-9, T, K, Q, J, A): ");
  57.     scanf(" %c", &card1);
  58.  
  59.     printf("Enter the second card (2-9, T, K, Q, J, A): ");
  60.     scanf(" %c", &card2);
  61.  
  62.     int total = blackjack_hand_value(card1, card2);
  63.  
  64.     if (total == -1) {
  65.         printf("Invalid card input. Please enter valid cards.\n");
  66.     } else {
  67.         printf("The total value of the hand is: %d\n", total);
  68.     }
  69.  
  70.     return 0;
  71. }
Success #stdin #stdout 0s 5272KB
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Enter the first card (2-9, T, K, Q, J, A): Enter the second card (2-9, T, K, Q, J, A): Invalid card input. Please enter valid cards.
https://ideone.com/YSbYMW
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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