C++ 如何在c++； void deleteNodeByKey（int k）{ if（head==NULL）{ 下一步； 下一步； currentptr=currentptr->next； } } 如果（温度！=NULL）{ prevptr->n

如何在c++；

void deleteNodeByKey（int k）{
if（head==NULL）{
下一步；
下一步；
currentptr=currentptr->next；
}
}
如果（温度！=NULL）{
prevptr->next=temp->next；
库特
void deleteNodeByKey(int k) {
    if (head == NULL) {
        cout << "Singly Linked List already Empty. Cant delete" << endl;
    }
    else if (head != NULL) {
        if (head->key == k) {
            head = head->next;
            cout << "Node UNLINKED with keys value : " << k << endl;
        }
        else {
            node* temp = NULL;
            node* prevptr = head;
            node* currentptr = head->next;
            while (currentptr != NULL) {
                if (currentptr->key == k) {
                    temp = currentptr;
                    currentptr = NULL;
                }
                else {
                    prevptr = prevptr->next;
                    currentptr = currentptr->next;
                }
            }
            if (temp != NULL) {
                prevptr->next = temp->next;
                cout << "Node UNLINKED with keys value : " << k << endl;
            }
            else {
                cout << "Node Doesn't exist with key value : " << k << endl;
            }
        }
    }