c - 附加到链表 C

Question

我想将新值追加到链表尾部，但由于某种原因，这些值似乎没有被追加。对于新的链表分配:

struct checkPoints *checkPt = *checkPoint;

while (checkPt != NULL) {
    checkPt = checkPt->next;
}
if (checkPt == NULL) {
    checkPt = malloc(sizeof (struct checkPoints));
    scanf("%c %d %d %d %d\n", &checkPt->dropOut, &checkPt->currentPoint, &checkPt->competitor, &checkPt->hour, &checkPt->minute);
}

想法？

Answer 1

您没有将新项目添加到列表中(并且在分配新项目时也忘记了列表的末尾)。尝试

struct checkPoints *tail = *checkPoint;

struct checkPoints *newItem = malloc(sizeof (struct checkPoints));
scanf("%c %d %d %d %d\n", &checkPt->dropOut, &checkPt->currentPoint,
                          &checkPt->competitor, &checkPt->hour,
                          &checkPt->minute);
newItem->next = NULL;

if (tail == NULL) {
    *checkPoint = newItem
}
else {
    while (tail->next != NULL) {
        tail = tail->next;
    }
    tail->next = newItem;
}