复制c中的链接列表

Question

typedef struct slist *LInt;

typedef struct slist{

int value;
LInt prox;
}Node;

LInt clone2(LInt l){

LInt nova=NULL,aux2=NULL;
while(l){
    aux2=nova;
    nova=(LInt)malloc(sizeof(Node));
    nova->value=l->value;
    nova->prox=aux2;
    l=l->prox;
    }
return nova;
}

This function is supposed to copy a linked list, but this way, when I call the function to print it on screen, the list comes up reversed... Any help or tip? Thank you in advance!

Answer 1

you have nova->prox=aux2; where aux2 is the previous node....thus, you are actually pointing backwards in the linked list.

Pls look at these links for correct logic:

Coding a function to copy a linked-list in C++

Adapted @templatetypedef's answer from How do you copy a linked list into another list?

LInt Clone(LInt l) {
if (l == NULL) return NULL;

LInt result = (LInt)malloc(sizeof(Node));
result->value = l->value;
result->prox = Clone(l->next);
return result;
}

Answer 2

LInt clone2(LInt l){
    LInt ret=NULL;
    LInt nova, aux2 = NULL;
    while(l){
        nova=(LInt)malloc(sizeof(Node));
        if(!ret) ret = nova;
        if(aux2) aux2->prox = nova;
        nova->value=l->value;
        nova->prox = NULL;
        aux2 = nova;
        l=l->prox;
    }
    return ret;
}