simple-utils/mini-poker/cards.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "cards.h"

// Limits of the deck: 13 cards over 4 different suits possible.
#define MAX_CARD 13
#define MAX_SUIT 4


// This function validates the card (suit and value) and prints a description 
// of it to stdout. Sample descriptions: 2 of Hearts. King of Spades.
// Returns 0 if the card is valid, 1 if it's not (either invalid suit or value)
int 
describe_card(struct playingcard c)
{
    if (c.value < 1 || c.value > 13) {
        printf("Error: you've passed an invalid card!\n");
        return 1;
    }
    if (c.suit < 1 || c.suit > 4) {
        printf("Error: your card has an invalid suit!\n");
        return 1;
    }
    
    switch(c.value) {
        case 1:
            printf("Ace");
            break;
        case 11:
            printf("Jack");
            break;
        case 12:
            printf("Queen");
            break;
        case 13:
            printf("King");
            break;
        default:
            printf("%d", c.value);
    }
    
    // (value) of (suit)
    printf(" of ");
    
    switch(c.suit) {
        case 1:
            printf("Diamonds\n");
            break;
        case 2:
            printf("Clubs\n");
            break;
        case 3:
            printf("Hearts\n");
            break;
        case 4:
            printf("Spades\n");
            break;
    }
    return 0;
}

// This function creates a random card from the playing deck.
struct playingcard
draw_card()
{
    int dice = 0;
    struct playingcard card;

    dice = rand() % MAX_CARD;
    if (dice == 0) 
        dice += 1;
    card.value = dice;

    dice = rand() % MAX_SUIT;
    if (dice == 0) 
        dice += 1;
    card.suit = dice;

    return card;
}