c - 使用结构数组在 C 中进行选择排序，错误 : "lvalue required..."

Question

尝试对结构数组进行排序。 Struct是下面定义的TextArt

typedef struct  //struct that holds ASCII art
{
    char artistName[80];    //name of artist
    char asciiArt[20][80];  //actual ascii art line by line
    int rating;             //rating of art
}TextArt;

不过我不认为该结构与此有任何关系。我得到编译器错误

错误:当尝试将一个结构分配给另一个结构时，左值需要作为赋值的左操作数(见下文)

temp = asciiArt+pos_min;
asciiArt+pos_min = asciiArt+i;  //error here
asciiArt+i = *temp;  //error also here

调用函数

selectionSort(artPtr, artArrSize);

和完整的选择排序功能。关于使用 = 在 C 中分配结构，我有什么不理解的地方吗？我认为要么是这个，要么是我传递的 TextArt 数组有某种错误。请赐教，谢谢。

void selectionSort(TextArt *asciiArt, int size)
{
    //pos_min is short for position of min
    int pos_min;
    TextArt *temp;
    int i=0;
    int j=0;

    for (i=0; i < size-1; i++)
    {
        pos_min = i;//set pos_min to the current index of array

        for (j = i + 1; j < size; j++)
        {
            if ((strncmp((asciiArt+i)->artistName, (asciiArt+j)->artistName)) < 0)
            {
                pos_min = j; //pos_min will keep track of the index that min is in, this is needed when a swap happens
            }
        }

    //if pos_min no longer equals i than a smaller value must have been found, so a swap must occur
            if (pos_min != i)
            {
                printf("copying...\n");
                temp = asciiArt+pos_min;
                asciiArt+pos_min = asciiArt+i;
                asciiArt+i = *temp;
    }
}

Answer 1

交换两个结构的正确方法是:

if (pos_min != i)
{
    printf("copying...\n");
    const TextArt temp = asciiArt[pos_min]; //equivalent to: *(asciiArt + pos_min)
    asciiArt[pos_min] = asciiArt[i];
    asciiArt[i] = temp;
}