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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;
  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.  
  53.     }//if
  54.     else
  55.     {
  56.          //loop to determine hand value 
  57.          for(int i = 0;i < 2; ++i)
  58.          {
  59.               // Determines value of number cards by subtracting by 0 to change char to int
  60.               if(hand[i] >= '2' && hand[i] <= '9')
  61.               {
  62.                   handValue += hand[i] - '0';
  63.               }//if
  64.  
  65.               //Assigns value of tens and face cards as 10 
  66.               else if(hand[i] =='T'||hand[i] =='J'||hand[i] =='Q'||hand[i] =='K')
  67.               {
  68.                   handValue += 10;
  69.               }// else if
  70.  
  71.               //Assigns value of Aces as 11
  72.               else if(hand[i] =='A')
  73.               {
  74.                   handValue += 11;
  75.               }//else if
  76.  
  77.               //catches invalid entries and returns -1 and error message
  78.               else
  79.               {
  80.                    //error message for invalid entry and returns -1
  81.                    printf("\nInvalid card");
  82.                    return -1;
  83.               }//else
  84.  
  85.          }//for
  86.     }//else
  87.  
  88.     //message to display score
  89.     printf("\nThe score is %d", handValue);
  90.  
  91.     //if hand is valid returns point value
  92.     return handValue;
  93.  
  94. }//blackJackValue
  95.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
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/P2upfE
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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