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  1. #include <stdio.h>
  2.  
  3. int is_valid(char c) {
  4.     return (c >= '2' && c <= '9') || c == 'T' || c == 'J' || c == 'Q' || c == 'K' || c == 'A';
  5. }
  6.  
  7. int get_value(char c) {
  8.     if (c >= '2' && c <= '9') {
  9.         return c - '0';
  10.     } else if (c == 'T' || c == 'J' || c == 'Q' || c == 'K') {
  11.         return 10;
  12.     } else { // 'A'
  13.         return 11;
  14.     }
  15. }
  16.  
  17. int calculate_blackjack_score(char c1, char c2) {
  18.     if (!is_valid(c1) || !is_valid(c2)) {
  19.         return -1;
  20.     }
  21.     int v1 = get_value(c1);
  22.     int v2 = get_value(c2);
  23.     int sum = v1 + v2;
  24.     int ace_count = (c1 == 'A') + (c2 == 'A');
  25.     if (ace_count == 2) {
  26.         sum -= 10;
  27.     }
  28.     return sum;
  29. }
  30.  
  31. int main() {
  32.     char card1, card2;
  33.     printf("Enter cards: ");
  34.     scanf(" %c %c", &card1, &card2);
  35.  
  36.     int score = calculate_blackjack_score(card1, card2);
  37.  
  38.     if (score == -1) {
  39.         if (!is_valid(card1)) {
  40.             printf("*** Would be invalid, %c is not a valid card\n", card1);
  41.         } else {
  42.             printf("*** Would be invalid, %c is not a valid card\n", card2);
  43.         }
  44.     } else {
  45.         printf("The score is %d\n", score);
  46.     }
  47.  
  48.     return 0;
  49. }
Success #stdin #stdout 0s 5272KB
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Enter cards: The score is 21
https://ideone.com/Onh3pU
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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