.gitignore

main
*.dSYM

main.c

#include <stdlib.h>
#include <stdio.h>

typedef struct Node {
    int value;
    struct Node *next;
} Node;

typedef struct List {
    Node *head;
    int count;
} List;

Node *
node_create(int value)
{
    Node *node = calloc(1, sizeof(Node));

    node->value = value;
    node->next  = NULL;

    return node;
}

List *
list_create()
{
    List *list = calloc(1, sizeof(List));

    list->head  = NULL;
    list->count = 0;

    return list;
}

Node *
list_push(List *list, int value)
{
    Node *cur  = NULL,
         *tail = NULL,
         *new = node_create(value);

    if (!list->head) {
        // No elements in the list, just make this one the head.
        list->head = new;
    } else {
        for (cur = list->head; cur != NULL; cur = cur->next) {
            tail = cur;
        }

        tail->next = new;
    }

    list->count++;

    return new;
}

void
list_print(List *list)
{
    int  i    = 1;
    Node *cur = NULL;

    for (cur = list->head; cur != NULL; cur = cur->next) {
        printf("Value of element #%d is: %d\n", i, cur->value);
        i++;
    }

    printf("\n");
}

void
list_remove_value(List *list, int value)
{
    Node *cur  = list->head,
         *prev = cur;

    while (cur != NULL) {
        if (cur->value == value) {
            if (list->head == cur) {
                list->head = cur->next;
            } else {
                prev->next = cur->next;
            }

            free(cur);

            return;
        }

        prev = cur;
        cur  = cur->next;
    }
}

int
list_sum(List *list)
{
    int sum = 0;

    Node *cur = NULL;

    for (cur = list->head; cur != NULL; cur = cur->next) {
        sum = sum + cur->value;
    }

    return sum;
}

void
list_free(List *list)
{
    Node *current,
         *next = list->head;

    while (next != NULL) {
        current = next;
        next    = current->next;

        free(current);
    };

    free(list);
}

int
main()
{
    List *list = list_create();

    list_push(list, 1);
    list_push(list, 2);

    printf("Sum: %d\n", list_sum(list));
    list_print(list);

    list_remove_value(list, 1);

    printf("Sum: %d\n", list_sum(list));
    list_print(list);

    list_free(list);

    return 0;
}

Makefile

CFLAGS=-g -Wall -Wextra

all: main

clean:
	rm -rf main *.dSYM