结构帮助.将卡片结构分配给存储在牌组结构中的一系列卡片 [英] Struct help. Assigning a card struct to an array of cards held in a deck struct

问题描述

这是我的两个结构:

typedef struct _card {
    int suit;
    int value;
} card;

typedef struct _deck {
    int num_cards;
    card *cards;
} deck;

这是我的制作卡片功能:

This is my make a card function:

card *make_card(int suit, int value)
{
  card *newCard = malloc(sizeof(card));
  newCard->suit = suit;
  newCard->value = value;

  return newCard;
}

现在我有点卡住了.我必须做一副纸牌.我知道如何为卡分配每个值，但是我对如何在内存中分配值感到困惑.我知道这与卡组结构中的一系列纸牌有关，但我不知道该怎么做.

Now is where I am a bit stuck. I have to make a deck of cards. I know how to assign each value to the card, but I am stumped on how to allocate it in memory. I know it has to do with an array of cards in the deck struct but i cant figure out how.

deck *make_standard_deck()
{
  for (int i = 0; i <= 3; i++)
  {
    for (int j = 1; j <= 13; j++)
    {
      deck.cards[i] = make_card(int suit, int value);
    }
  }
}

推荐答案

要创建平台，请首先为平台结构分配内存，然后(假设您要使用指向卡片的指针数组)为指针数组分配内存.这是一个创建52张标准牌的示例.

To create a deck, first allocate memory for the deck structure, and then (assuming that you want an array of pointers to cards) allocate memory for the pointer array. Here's an example that creates a standard deck of 52 cards.

#include <stdio.h>
#include <stdlib.h>

typedef struct _card {
    int suit;
    int value;
} card;

typedef struct _deck {
    int num_cards;
    card **cards;
} deck;

card *make_card(int suit, int value)
{
    card *newCard = malloc(sizeof(card));
    newCard->suit = suit;
    newCard->value = value;

    return newCard;
}

deck *make_standard_deck( void )
{
    deck *newDeck = malloc( sizeof(deck) );

    newDeck->num_cards = 52;
    newDeck->cards = malloc( 52 * sizeof(card *) );

    int index = 0;
    for ( int suit = 0; suit < 4; suit++ )
        for ( int value = 1; value <= 13; value++ )
            newDeck->cards[index++] = make_card( suit, value );

    return newDeck;
}

int main( void )
{
    int i;

    deck *stdDeck = make_standard_deck();

    for ( i = 0; i < stdDeck->num_cards; i++ )
        printf( "suit=%d value=%2d\n", stdDeck->cards[i]->suit, stdDeck->cards[i]->value );

    /* free the deck when we're done with it */
    for ( i = 0; i < stdDeck->num_cards; i++ )
        free( stdDeck->cards[i] );
    free( stdDeck->cards );
    free( stdDeck );
}

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