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  1. // **************************************************
  2. // Function: blackJackValue
  3. //
  4. // Description: Calculates the blackjack value of two cards
  5. //
  6. // Parameters: card1 - first card (char)
  7. //             card2 - second card (char)
  8. //
  9. // Returns: total hand value
  10. //          -1 if invalid card
  11. //
  12. // **************************************************
  13.  
  14. #include <stdio.h>
  15.  
  16. // function prototype
  17. int blackJackValue(char card1, char card2);
  18.  
  19. int main()
  20. {
  21.     char card1, card2;
  22.     int result;
  23.  
  24.     // prompt user for cards
  25.     printf("Enter first card (2-9, T, J, Q, K, A): ");
  26.     scanf(" %c", &card1);
  27.  
  28.     printf("Enter second card (2-9, T, J, Q, K, A): ");
  29.     scanf(" %c", &card2);
  30.  
  31.     // call function
  32.     result = blackJackValue(card1, card2);
  33.  
  34.     // check for invalid result
  35.     if(result != -1)
  36.     {
  37.         printf("\nFinal Hand Value: %d\n", result);
  38.     }
  39.  
  40.     return 0;
  41. }
  42.  
  43. int blackJackValue(char card1, char card2)
  44. {
  45.     int handValue = 0;   // MUST initialize
  46.     char hand[2] = {card1, card2};
  47.  
  48.     // check for two Aces
  49.     if(hand[0] == 'A' && hand[1] == 'A')
  50.     {
  51.         handValue = 12;
  52.         printf("\nThe score is %d", handValue);
  53.         return handValue;
  54.     }
  55.  
  56.     // loop to determine hand value
  57.     for(int i = 0; i < 2; ++i)
  58.     {
  59.         // number cards
  60.         if(hand[i] >= '2' && hand[i] <= '9')
  61.         {
  62.             handValue += hand[i] - '0';
  63.         }
  64.  
  65.         // face cards
  66.         else if(hand[i] == 'T' || hand[i] == 'J' || hand[i] == 'Q' || hand[i] == 'K')
  67.         {
  68.             handValue += 10;
  69.         }
  70.  
  71.         // Ace
  72.         else if(hand[i] == 'A')
  73.         {
  74.             handValue += 11;
  75.         }
  76.  
  77.         // invalid
  78.         else
  79.         {
  80.             printf("\nInvalid card");
  81.             return -1;
  82.         }
  83.     }
  84.  
  85.     printf("\nThe score is %d", handValue);
  86.     return handValue;
  87. }
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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Enter first card (2-9, T, J, Q, K, A): Enter second card (2-9, T, J, Q, K, A): 
Invalid card
https://ideone.com/xZ89Yv
language:
C++ (gcc 8.3)
created:
18 hours ago
visibility:
public

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