C数组，为什么每个元素都包含相同的值？

Question

下面是 MRE 和输出（截断）。当我使用 gdb 时，我确认我的牌组数组的每个元素都包含每张单独的卡片。但是，当我遍历牌组数组时，所有的牌都是黑桃 A。为什么？我尝试过尽职调查。程序编译并运行。逻辑似乎是正确的。

编译

gcc -g prog33.c -o prog33.exe -Wall

MRE

//includes
#include <stdio.h>
#define DECK 52

//variable and function declarations
enum suit { clubs, diamonds, hearts, spades }; 
enum value { two, three, four, five, six, seven, eight, nine, ten, jack, queen, king, ace };
char *Suit[] = {"Clubs","Diamonds","Hearts","Spades" };
char *Values[] = {"Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten","Jack","Queen","King","Ace" };
char  *deck[DECK];
char mycard[20];

//main function
int main(int argc, char *argv[])
{
    printf("prog33.c, enums\n");

    for(int s = clubs; s <= spades; s++)
    {
        printf("%d. %s\n", s, Suit[s]);
        for(int v = two; v <= ace; v++)
        {
            int idx = (s*13) + v;
            sprintf(mycard, "%s of %s", Values[v], Suit[s]);
            printf("    %d, %s, %d, --- %s\n", v, Values[v], idx, mycard);
            deck[idx] = mycard;
            printf("        %i. %s\n", idx, deck[idx]);
        }
    }; 

    for(int i = 0; i < DECK; i++) printf("%d. %s\n", i, deck[i]);
    return 0;
}

输出（截断）

    ...
    11, King, 24, --- King of Diamonds
        24. King of Diamonds
    12, Ace, 25, --- Ace of Diamonds
        25. Ace of Diamonds
2. Hearts
    0, Two, 26, --- Two of Hearts
        26. Two of Hearts
    1, Three, 27, --- Three of Hearts
        27. Three of Hearts
    2, Four, 28, --- Four of Hearts
        28. Four of Hearts
    3, Five, 29, --- Five of Hearts
        29. Five of Hearts
    4, Six, 30, --- Six of Hearts
        30. Six of Hearts
...
    21. Ace of Spades
    22. Ace of Spades
    23. Ace of Spades
    24. Ace of Spades
    25. Ace of Spades
    26. Ace of Spades
    27. Ace of Spades
    28. Ace of Spades
    29. Ace of Spades
    ...

Answer 1

尝试it.You会找到原因。

#include <stdio.h>
#include <string.h>
#define DECK 52

//variable and function declarations
enum suit { clubs, diamonds, hearts, spades }; 
enum value { two, three, four, five, six, seven, eight, nine, ten, jack, queen, king, ace };
char *Suit[] = {"Clubs","Diamonds","Hearts","Spades" };
char *Values[] = {"Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten","Jack","Queen","King","Ace" };
char  deck[DECK][128];
char mycard[20];

//main function
int main(int argc, char *argv[])
{
    printf("prog33.c, enums\n");

    for(int s = clubs; s <= spades; s++)
    {
        printf("%d. %s\n", s, Suit[s]);
        for(int v = two; v <= ace; v++)
        {
            int idx = (s*13) + v;
            sprintf(mycard, "%s of %s", Values[v], Suit[s]);
            printf("    %d, %s, %d, --- %s\n", v, Values[v], idx, mycard);
            strcpy(deck[idx], mycard);
            printf("        %i. %s\n", idx, deck[idx]);
        }
    }; 

    for(int i = 0; i < DECK; i++) printf("%d. %s\n", i, deck[i]);
    return 0;
}

C数组，为什么每个元素都包含相同的值？

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