由于阵列使用，检测到堆损坏

对不起，我是C++和编程的新手，遇到了堆损坏错误。我想我是在未分配的内存中写的，但我似乎找不到错误在哪里……程序很容易接受用户输入值，并重新排列它们，使它们上升。我也在学习模板。

#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
template <typename T>
void sort(T arrayz[], int size, char ch)
{
    T temporary;
    int k, j;
    if (ch = 'a')
    {
        for (k = 0; k < size; k++)
        {
            for (j = 0; j < size; j++)
            {
                temporary = arrayz[j];
                arrayz[j] = arrayz[j + 1];
                arrayz[j + 1] = temporary;
            }
        }
    }
}
int main()
{
    int choices, range, i;
    int x;
    char ch;
    cout << ("Enter the amount of numbers you want =>");
    cin >> x;
    int *numbers = new int[x];
    if (!numbers)
    {
        cout << "Memory Allocation error!";
        cin.get();
        exit(1);
    }
    for (int i = 0; i<x; i++)
    {
        cout << "Option number" << i + 1 << " =>";
        cin >> numbers[i];
    }
    cout << "Do you want ascending or descending values (a/d) =>" ;
    cin >> ch;
    if (ch = 'a')
    {
        sort(numbers, x, ch);
    }
    else if (ch = 'd')
    {
        sort(numbers, x, ch);
    }
    delete[] numbers;
    fflush(stdin);
    cin.get();
    return 0;
}