1 files changed, 98 insertions, 0 deletions
diff --git a/data_structures/linked_list.c b/data_structures/linked_list.c
new file mode 100644
index 0000000..b75dfea
--- /dev/null
+++ b/data_structures/linked_list.c
@@ -0,0 +1,98 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct Node{
+	int value;
+	struct Node* next;
+}list;
+
+void* create_list(){
+	void* ptr = NULL; 
+	return ptr;
+}
+
+void add_node(list **head, int value){
+	list *node = (list*)malloc(sizeof(list));
+	node->value = value;
+	node->next = NULL;
+	
+	if(*head == NULL){
+		*head = node;
+	}else{
+		list *tmp = *head;
+		while(tmp->next != NULL){
+			tmp = tmp->next;
+		}
+		tmp->next = node;
+	}
+}
+
+void print_list(list *head){
+	while(head != NULL){
+		printf("%d -> ", head->value);
+		head = head->next;
+	}
+	printf("\n");
+}
+
+void remove_first(list **head){
+	list *tmp = *head;
+	*head = (*head)->next;
+	free(tmp);
+}
+
+int list_len(list *head){
+	int cont = 0;
+	while(head != NULL){
+		cont++;
+		head = head->next;
+	}
+	return cont;
+}
+
+void add_node_pos(list **head, int pos, int value){
+	if(pos > list_len(*head)){
+		fprintf(stderr, "Posicao nao existe\n");
+		return;
+	}
+
+	list *new_node = (list*)malloc(sizeof(list));
+	new_node->value = value;
+
+	if(pos == 0){
+		new_node->next = *head;
+		*head = new_node;
+		return;
+	}
+	
+
+	int cont = 0;
+	list *f = *head;
+	list *s = NULL;
+	while(cont != pos){
+		s = f;
+		f = f->next;
+		cont++;
+	}
+	s->next = new_node;
+	new_node->next = f;
+}
+
+int main(int argv, char* argc[]){
+	list *l = create_list();
+	
+	add_node(&l, 10);
+	add_node(&l, 20);
+	add_node(&l, 30);
+	print_list(l);
+	add_node_pos(&l, 3, 50);
+	print_list(l);
+	add_node_pos(&l, 3, 40);
+	print_list(l);
+	add_node_pos(&l, 0, 0);
+	print_list(l);
+	add_node_pos(&l, 1, 5);
+	print_list(l);
+
+	return 0;
+}