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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. int blackjackScore(char card1, char card2) 
  5. {
  6.  
  7.     // Convert cards to uppercase
  8.     card1 = toupper(card1);
  9.     card2 = toupper(card2);
  10.  
  11.     int value1 = 0;
  12.     int value2 = 0;
  13.  
  14.     // Card value calculations made into another function for better maintainability
  15.     int calcCardValue(char card) 
  16.     {
  17.         if (card >= '2' && card <= '9') 
  18.         {
  19.             return card - '0'; // Regular cards 2 through 9
  20.         }
  21.  
  22.         else if (card == 'T' || card == 'J' || card == 'Q' || card == 'K')
  23.         {
  24.             return 10; // For face cards
  25.         }
  26.  
  27.         else if (card == 'A')
  28.         {
  29.             return 11; // For ace
  30.         }
  31.  
  32.         else
  33.         {
  34.             return -1; // Invalid card
  35.         } // If end
  36.     }
  37.  
  38.     value1 = calcCardValue(card1);
  39.     value2 = calcCardValue(card2);
  40.  
  41.     // Check for invalid input
  42.     if (value1 == -1 || value2 == -1)
  43.     {
  44.         printf("*** Invalid card entered.\n");
  45.         return -1;
  46.     }
  47.  
  48.     // Checks if you are dealt two aces, makes them equal 11+1=12
  49.     if (card1 == 'A' && card2 == 'A')
  50.     {
  51.         return 12;
  52.     }
  53.  
  54.     // makes one ace equal 1 instead so you don't bust
  55.     int total = value1 + value2;
  56.     if ((card1 == 'A' || card2 == 'A') && total > 21)
  57.     {
  58.         total -= 10; // 11 - 10 = 1
  59.     }
  60.  
  61.     return total;
  62. }
  63.  
  64. int main() 
  65. {
  66.     char c1, c2;
  67.     printf("Enter two cards: ");
  68.     scanf(" %c %c", &c1, &c2);
  69.  
  70.     int score = blackjackScore(c1, c2);
  71.     if (score != -1) 
  72.     {
  73.         printf("The score is %d\n", score);
  74.     }
  75.  
  76.     return 0;
  77. }
  78.  
Success #stdin #stdout 0s 5296KB
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Enter two cards: The score is 21
https://ideone.com/yY20Ry
K A
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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