このコードで問題が発生したのは、最初の繰り返しでaddTrash関数内でstruct node * headを返そうとしたときです。私はそれがスタックの破損かもしれないと思うが、私は確かにわからないし、私はあなたが与えたコード内のエラーが何であるかを正確に把握する方法を知らない。SegFault on returnステートメントC
これは、データが保持する唯一のデータとして値を持つ、二重リンクされたリンクリストです。あなたのコードで
struct node * modifyMainList(struct node *head, int link2Delete){
struct node * curr = head;
struct node * temp;
int i = 0;
//traverse list link2Delete amount of times
while(i != link2Delete){
curr = curr -> next;
}
//head case
if(curr -> previous == NULL){
curr = curr -> next;
head = curr;
return head;
}
//tail case
if(curr -> next == NULL){
temp = curr;
curr = curr -> previous;
curr -> next = NULL;
temp -> previous = NULL;
temp -> next = NULL;
free(temp);
return head;
}
curr -> previous -> next = curr -> next;
curr -> next -> previous = curr -> previous;
curr -> previous = NULL;
curr -> next = NULL;
free(curr);
return head;
}
struct node * addTrash(struct node *mainHead, int link2Delete){
struct node * head = NULL;
struct node * curr = mainHead;
struct node * trashCurr = NULL;;
struct node * temp = NULL;
int i = 0;
printf("im in trash before loop\n\n");
for(i = 0; i < link2Delete; i++){
curr = curr -> next;
}
printf("im in trash before head size check\n\n");
if(head == NULL){
printf("im in trash with head == null\n\n");
//head of main list
if(link2Delete == 0){
printf("im in trash link2delete == null\n\n");
curr = curr -> previous;
head = curr;
curr = curr -> next;
curr -> previous = NULL;
curr -> next = NULL;
return head;
}
printf("im in trash before tail case\n\n");
//tail of main list
if(curr -> next == NULL){
printf("im in trash with tail case\n\n");
head = curr;
head -> previous = NULL;
return head;
}
printf("im in trash before after tail case\n\n");
//every other case
//printf("this is the head value: %d\n\n", head -> value);
head = curr;
//printf("im in trash after head = curr\n\n");
head -> previous = NULL;
//printf("im in trash after head -> previous\n\n");
head -> next = NULL;
printf("im in trash after head -> next\n\n");
printf("this is the head value: %d\n\n", head -> value);
return head;
}else{
printf("im in trash inside else\n\n");
trashCurr = head;
while(trashCurr -> next != NULL){
trashCurr = trashCurr -> next;
}
if(link2Delete == 0){
temp = curr;
trashCurr -> next = temp;
temp -> previous = trashCurr;
trashCurr = temp;
trashCurr -> next = NULL;
return head;
}
//tail of main list
if(curr -> next == NULL){
temp = curr;
trashCurr = temp;
temp -> previous = trashCurr;
temp -> next = NULL;
trashCurr -> next = temp;
return head;
}
//every other case
temp = curr;
temp -> previous = trashCurr;
trashCurr -> next = temp;
trashCurr = temp;
trashCurr -> next = NULL;
return head;
}
}
void generateRandom(struct node *mainHead, int size){
int i = 0;
int link2Delete = 0;
struct node *head = NULL;
srand (time(NULL));
int number2Delete = rand() % size + 1;
printf("this is the rand number: %d\n", rand());
printf("this is the number of nodes to be deleted: %d\n", number2Delete);
for (i = 0; i < number2Delete; i++) {
// Pick a random node (payload) to delete.
link2Delete = (rand() % size);
printf("this is the number of nodes in the list: %d\n", size);
printf("this is the node to be deleted: %d\n", link2Delete);
size--;
if(link2Delete == 0){
mainHead = modifyMainList(mainHead, link2Delete);
//printf("this is the call return: %d\n\n", addTrash(mainHead, link2Delete) -> value);
head = addTrash (mainHead, link2Delete);
}else{
head = addTrash (mainHead, link2Delete);
mainHead = modifyMainList(mainHead, link2Delete);
}
}
return;
}
デバッガでプログラムを試しましたか?セグメンテーション違反の原因となる可能性があることが強調される可能性があります。 –
私はこのコンピュータにデバッガを持っておらず、この学校コンピュータでデバッガを入手できません –
ここでmain()は何ですか?私は自分のコンピュータでそれを実行したい。 –