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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. // Function to get the value of a single card
  5. int get_card_value(char card) {
  6.     card = toupper(card); // Convert to uppercase for consistency
  7.     if (card >= '2' && card <= '9') {
  8.         return card - '0'; // Convert char '2'-'9' to integer 2-9
  9.     } else if (card == 'T' || card == 'K' || card == 'Q' || card == 'J') {
  10.         return 10; // Face cards are worth 10 points
  11.     } else if (card == 'A') {
  12.         return 11; // Aces are worth 11 points by default
  13.     } else {
  14.         return -1; // Invalid card
  15.     }
  16. }
  17.  
  18. // Function to calculate the total value of a two-card blackjack hand
  19. int blackjack_hand_value(char card1, char card2) {
  20.     /**
  21.      * Calculate the point total of a two-card blackjack hand.
  22.      *
  23.      * Parameters:
  24.      * - card1: The first card in the hand ('2'-'9', 'T', 'K', 'Q', 'J', 'A').
  25.      * - card2: The second card in the hand ('2'-'9', 'T', 'K', 'Q', 'J', 'A').
  26.      *
  27.      * Returns:
  28.      * - int: The point total of the hand.
  29.      * - -1: If invalid input is provided.
  30.      */
  31.  
  32.     // Get the values of the two cards
  33.     {
  34.     int value1 = get_card_value(card1);
  35.     int value2 = get_card_value(card2);
  36.  
  37.     // Check for invalid input
  38.     if (value1 == -1 || value2 == -1) {
  39.         return -1; // Return -1 to indicate an error
  40.     }
  41.  
  42.     // Calculate the total value of the hand
  43.     int total = value1 + value2;
  44. 	if (total == 22)
  45. 	{
  46. 		total = 11;
  47. 	}
  48.     // Adjust for multiple aces (if both cards are aces)
  49.     return total;
  50.     }
  51. }
  52.  
  53. int main() {
  54.     // Example usage
  55.     char card1, card2;
  56.  
  57.     printf("Enter the first card (2-9, T, K, Q, J, A): ");
  58.     scanf(" %c", &card1);
  59.  
  60.     printf("Enter the second card (2-9, T, K, Q, J, A): ");
  61.     scanf(" %c", &card2);
  62.  
  63.     int total = blackjack_hand_value(card1, card2);
  64.  
  65.     if (total == -1) {
  66.         printf("Invalid card input. Please enter valid cards.\n");
  67.     } else {
  68.         printf("The total value of the hand is: %d\n", total);
  69.     }
  70.  
  71.     return 0;
  72. }
  73.  
Success #stdin #stdout 0.01s 5280KB
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stdin
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Standard input is empty
stdout
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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/zKke1W
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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