C 程序编号未正确排序数组

Question

我有一个产品结构数组，我试图按名称、类型、价格和数量对它们进行排序。名称和类型有效，但价格和数量无效。我的代码是:

else if (sort == sortByPrice)
{
    for (int i = 0; i < numProducts; i++)
    {
        int smallPosition = i;
        for (int x = i + 1; x < numProducts; x++)
        {
            if (list[i].price > list[x].price)
            {
                smallPosition = x;
            }
        }

        temp = list[i];
        list[i] = list[smallPosition];
        list[smallPosition] = temp;
    }

}
else if (sort == sortByQty)
{
    for (int i = 0; i < numProducts; i++)
    {
        int smallPosition = i;
        for (int x = i + 1; x < numProducts; x++)
        {
            if (list[i].qty > list[x].qty)
            {
                smallPosition = x;
            }
        }

        temp = list[i];
        list[i] = list[smallPosition];
        list[smallPosition] = temp;
    }
}

谁能告诉我为什么它不起作用/如何解决它？

Answer 1

跟进 Lee Daniel Crocker的评论，你应该动态比较 smallPosition 的值而不是 i 以便它总是指向最小的剩余项目:

    int smallPosition = i;
    for (int x = i + 1; x < numProducts; x++)
    {
        if (list[smallPosition].price > list[x].price)
        {
            smallPosition = x;
        }
    }