how to remove a node from a linked list in c

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Kevin
27 Jan 2019
1typedef struct node{
2    int value; //this is the value the node stores
3    struct node *next; //this is the node the current node points to. this is how the nodes link
4}node;
5
6node *rmvNode(node *head, int index){
7    node *tmp = head;
8    node *rmv;
9    int count = 0;
10
11    //base case for if the user enters a value greater then or equal to the length of the head
12    //base case for if the user enters a value with a list of length 1. because in this library a list MUST contain one value minimum
13    if(index >= len(head) || len(head) == 1){
14        return NULL;
15    }
16  
17    //if you want to remove the first value
18    if(index == 0){
19        rmv = head; //stores the head at this given moment in time
20        head = tmp->next; //this jumps the position of the head making sure that the beginning is no longer part of the head
21        free(rmv); //this frees the memory given to the initial head
22        return head;
23    }
24
25    //if you want to remove index position 1
26    if(index == 1){
27        rmv = head->next;
28        head->next = tmp->next->next;
29        free(rmv);
30        return head;
31    }
32
33    //if you want to remove the last value
34    if(index == -1){
35        
36        while(count < len(head)-2){ //we do -2 because we want to access the node before the last one
37            tmp = tmp->next;
38            count += 1;
39        }
40        rmv = tmp->next;
41        tmp->next = NULL;
42        free(rmv);
43        return head;
44    }
45
46    //remove anything else
47    while(count < index-1){
48        tmp = tmp->next;
49        count += 1;
50    }
51    rmv = tmp->next;
52    tmp->next = tmp->next->next;
53    free(rmv);
54    return head;
55
56}
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