c - 在结构中初始化结构数组

Question

我看过其他问题，但似乎找不到明确的答案。如何在结构内声明结构数组？我试图在 main() 中执行此操作，但我不知道我是否做对了，而且我不断收到此警告:“初始化从不强制转换的指针生成整数”

#define MAXCARDS 20     

struct card {
    int priority;       
};

struct battleQ {
    struct card cards[MAXCARDS];
    int head;
    int tail;
    int size;
};

int main (int argc, char *argv[]) {
    struct battleQ bq;
    bq.cards = {
                      malloc(MAXCARDS * sizeof (struct card)), //Trouble with this part
                      0,
                      0,
                      0
                };

        //...

    return 1;
}

根据建议进行编辑:好的，现在我遇到了问题。我不断收到此错误:

3 [main] TurnBasedSystem 47792 open_stackdumpfile: Dumping stack trace to TurnBasedSystem.exe.stackdump

我不得不稍微更改代码并使所有内容都指向指针。我测试了它，一旦我尝试分配它的属性之一，它就会给我这个错误:bq->head = 0

整个过程只是将卡片添加到队列中。修改后的代码如下:

#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

#define MAXCARDS 20

struct card {
    int priority;       
};

// A queue defined by a circular array
struct battleQ {
    struct card *cards[MAXCARDS];
    int head;
    int tail;
    int size;
};

bool battleQEnqueue (struct battleQ *bq, struct card *c);
bool battleQisFull(struct battleQ *bq);

// Method for enqueuing a card to the queue
bool battleQEnqueue (struct battleQ *bq, struct card *c) {
    bool success = false;
    if (battleQisFull(&bq)) {
        printf("Error: Battle queue is full\n");
    } else {
        success = true;
        bq->cards[bq->tail] = c;
        bq->size = bq->size + 1;
        bq->tail = (bq->tail + 1) % MAXCARDS;
    }
    return success;
}

int main (int argc, char *argv[]) {
    int i;
    struct battleQ *bq;
    memset(&bq, 0, sizeof(bq));  // Did I do this properly?
    bq->tail = 0;               // Gives error at this point
    bq->head = 0;               
    bq->size = 0;

    // This is where I create a card and add it to the queue but the main problem
    // is still the initialization above
    for (i = 0; i < 5; i++) {
        struct card *c = malloc(sizeof(c));
        c->priority = i + 10;
        printf("%d,", c->priority);
        battleQEnqueue(&bq, &c);
    }

    return 1;
}

Answer 1

bq.cards 是结构数组，您不必 malloc 它。您可以将整个数组初始化为:

memset(bq.cards, 0, sizeof(bq.cards));

如果你想初始化bq做

    memset(&bq, 0, sizeof(bq));