Question

Use file operations (fopen, fgets, fprintf, feof, fclose) to create a simple to-do list.


Users can add new items, print the list, and erase the entire list (but may not erase individual items)


To-do items are stored in a file, one per line.


Example I/O:



Welcome to the To-Do List.

1) Print the list

2) Add to the list

3) Erase the list

4) Exit


What would you like to do? 2

What would you like add? Buy Apples

What would you like to do? 1

Your list:

Buy Apples

What would you like to do? 3

What would you like to do? 1

Your list:

What would you like to do? 4

Answer 1

#include <list>

#include <stdio.h>

using namespace std;

int main()

{

    list<char *> toDo;

    int command;

    FILE *f = fopen("toDoList", "r");

    if (f == NULL)

    {

        fclose(fopen("toDoList", "w"));

        f = fopen("toDoList", "r");

    }

    char *toAdd;

    while (!feof(f))

    {

        toAdd = new char[256];

        fgets(toAdd, 256, f);

        if (!feof(f))

            toDo.push_back(toAdd);

    }

    fclose(f);

    printf("Welcome to the To-Do List.\n1) Print the list\n");

    printf("2) Add to the list\n3) Erase the list\n4) Exit\n");

    while (true)

    {

        printf("What would you like to do? ");

        scanf("%d", &command);

        if (command == 1)

        {

            printf("Your list:\n");

            for (auto i = toDo.begin(); i != toDo.end(); i++)

                printf("%s", *i);

        }

        if (command == 2)

        {

            printf("What would you like add? ");

            toAdd = new char[256];

            fflush(stdin);

            fgets(toAdd, 257, stdin);

            toDo.push_back(toAdd);

        }

        if (command == 3)

        {

            for (auto i = toDo.begin(); i != toDo.end(); i++)

                delete [](*i);

            toDo.clear();

        }

        if (command == 4)

            break;

    }

    f = fopen("ToDoList", "w");

    for (auto i = toDo.begin(); i != toDo.end(); i++)

    {

        fputs(*i, f);

        delete []*i;

    }

    fclose(f);

    return 0;

}