函数返回字符数组时的C问题

这是我正在处理的作业头文件中的一个函数

#ifndef CARDGAMES_H
#define CARDGAMES_H

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

typedef struct {
    char suit;
    char label;
    int value;
} card ;

//function prototypes (removed the majority of them, this is just a segment of header file)

void addToDeck(card deck[], card toAdd, int * deckLength);
void printDeck(card deck[], int deckLength);

card removeCard(card deck[], int * deckLength, int index);


*/
card removeCard(card deck[], int * deckLength, int index){
        card removed = deck[index];
        int x = *deckLength;
        deck[index] = deck[x];
        deck[x] = removed;
        x=x-1;
        *deckLength = x;
        return removed;

下面是我运行编译程序后的输出：

     The deck after adding the ten of hearts: 
King of hearts
King of spades
King of diamonds
Queen of diamonds
ten of hearts
Testing removeCard.
    The deck after removing the first card: ten �?D
King of spades
King of diamonds
Queen of diamonds

---

这正是我所希望的。然而，十颗红心没有正确印刷。它有�?你在里面干什么？有人能解释一下我哪里出错了吗？

在C数组中，从0开始，所以

    int x = *deckLength;
    deck[index] = deck[x];

这是错误的。数组的最后一个元素具有arraySize-1索引

正确的代码应该是

card removeCard(card deck[], int * deckLength, int index){
        card removed = deck[index];
        int indexLast = *deckLength - 1;
        deck[index] = deck[indexLast];
        deck[indexLast] = removed;
        *deckLength -= 1;
        return removed;

---

更改int x=*deckLength；到int x=*deckLength-1；和*deckLength=x；至*deckLength=*deckLength-1；谢谢你，这就是解决办法。我很感激

card removeCard(card deck[], int * deckLength, int index){
        card removed = deck[index];
        int indexLast = *deckLength - 1;
        deck[index] = deck[indexLast];
        deck[indexLast] = removed;
        *deckLength -= 1;
        return removed;