Qt数组中的C++不允许传入或操作值

这个类将在visual Studio中进行精细编译并运行，它将在Qt中进行编译，但当数组实际用于createItem()中的==运算符时，它会出错。运行时显示segmentation fault。我尝试过手动在数组中设置值，但也不起作用。Qt是否不接受C++数组，因为此类在visual Studio编译和运行中运行良好。

此外，我是一个初学者，只会使用有效的代码，这段代码可能既不高效，也不节省内存，也不干净——它只是做了我现在想要做的事情。但你可能有任何改进都是受欢迎的。

#include "inventory.h"
#include <string>
#include <iostream>
inventory::inventory()
{
}

int inv[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
std::string itemName[1000] = {};
void inventory::setItem(int x) {
if (checkItem(x) == true) {
    for (int f = 0; f < 10 && f >= 0; ++f) {
        if (inv[f] == 0) {
            inv[f] = x;
            std::cout << "You have placed " << getItemName(x) << " in  your inventory." << std::endl;
            break;
        }
        else if (f == 9 && inv[f] != 0) {
            std::cout << "You have no more inventory space." << std::endl;
            break;
        }
    }
}
else {
    std::cout << "Item doesn't exist." << std::endl;
}
}
std::string inventory::getItemName(int x) {
std::string g = itemName[x];
return g;
}
void inventory::createItem(std::string y) {
bool exist = false;
for (int i = 0; i <= 1000; i++) {
    if (itemName[i] == y) {
        exist = true;
        break;
    }
}
for (int x = 1; x <= 1000; x++) {
    if (itemName[x] == "") {
        if (exist == false) {
            itemName[x] = y;
            break;
        }
        else if (exist == true) {
            std::cout << "ERROR: Item already exists" << std::endl;
            break;
        } 
    }
}
}
int inventory::getItemID(std::string y) {
for (int i = 0; i <= 1000; ++i) {
    if (itemName[i] == y) {
        return i;
    }
    else if (i == 1000 && itemName[i] != y) {
        std::cout << "ERROR: Item not found" << std::endl;
        return 1001;
    }
}
}
bool inventory::checkItem(int x) {
if (itemName[x] != "") {
    return true;
}
else {
    return false;
}
}
int inventory::checkInv(int x) {
for (int i = 0; i < 10; ++i) {
    if (inv[i] == x) {
        std::cout << "Item is in your inventory." << std::endl;
        return true;
        break;
    }
    else if (inv[i] == 9 && inv[9] != x) {
        std::cout << "You don't have the required item in your inventory." << std::endl;
        return false;
        break;
    }
}
}