{"id":145773,"date":"2025-07-09T18:20:16","date_gmt":"2025-07-09T12:50:16","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=145773"},"modified":"2025-07-09T18:20:16","modified_gmt":"2025-07-09T12:50:16","slug":"to-do-list-using-data-structures","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/to-do-list-using-data-structures\/","title":{"rendered":"DSA Project &#8211; To Do List"},"content":{"rendered":"<h3>Program 1<\/h3>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">\/\/ TO DO List Project Based on Linked List\r\n#include &lt;stdio.h&gt;\r\n#include &lt;stdlib.h&gt;\r\n#include &lt;string.h&gt;\r\n\r\ntypedef struct Task \r\n{\r\n    int id;\r\n    char description[100];\r\n    int completed;\r\n    struct Task* next;\r\n} Task;\r\n\r\nTask* head = NULL;    \/\/ First Node \r\nint taskCount = 0;\r\n\r\n\/\/ Function to create a new task\r\nTask* createTask(char desc[]) \r\n{\r\n    Task* newTask = (Task*)malloc(sizeof(Task));\r\n    newTask-&gt;id = ++taskCount;\r\n    strcpy(newTask-&gt;description, desc);\r\n    newTask-&gt;completed = 0;\r\n    newTask-&gt;next = NULL;\r\n    return newTask;\r\n}\r\n\r\n\/\/ Function to add a task\r\nvoid addTask() \r\n{\r\n    char desc[100];\r\n    getchar();  \/\/ clear buffer\r\n    printf(\"Enter task description: \");\r\n    fgets(desc, sizeof(desc), stdin);\r\n    desc[strcspn(desc, \"\\n\")] = '\\0';  \/\/ remove newline\r\n\r\n    Task* newTask = createTask(desc);\r\n\r\n    if (head == NULL) \r\n    {\r\n        head = newTask;\r\n    } else \r\n    {\r\n        Task* temp = head;\r\n        while (temp-&gt;next != NULL)\r\n            temp = temp-&gt;next;\r\n        temp-&gt;next = newTask;\r\n    }\r\n    printf(\"Task added successfully.\\n\");\r\n}\r\n\r\n\/\/ Function to display all tasks\r\nvoid displayTasks() \r\n{\r\n    if (head == NULL) \r\n    {\r\n        printf(\"To-Do List is empty.\\n\");\r\n        return;\r\n    }\r\n\r\n    Task* temp = head;\r\n    printf(\"\\nTo-Do List:\\n\");\r\n    while (temp != NULL) \r\n    {\r\n        printf(\"ID: %d | [%s] %s\\n\", temp-&gt;id,temp-&gt;completed ? \"X\" : \"*\", temp-&gt;description);\r\n        temp = temp-&gt;next;\r\n    }\r\n}\r\n\r\n\/\/ Function to mark a task as completed\r\nvoid markCompleted() \r\n{\r\n   if(head==NULL) \r\n    printf(\"To do list is empty\");\r\nelse\r\n{\r\n    int id;\r\n    printf(\"Enter task ID to mark as completed: \");\r\n    scanf(\"%d\", &amp;id);\r\n\r\n    Task* temp = head;\r\n    while (temp != NULL) \r\n    {\r\n        if (temp-&gt;id == id) \r\n        {\r\n            temp-&gt;completed = 1;\r\n            printf(\"Task marked as completed.\\n\");\r\n            return;\r\n        }\r\n        temp = temp-&gt;next;\r\n    }\r\n    printf(\"Task with ID %d not found.\\n\", id);\r\n}   \r\n}\r\n\r\n\/\/ Function to delete a task\r\nvoid deleteTask() \r\n{\r\n    int id;\r\n    printf(\"Enter task ID to delete: \");\r\n    scanf(\"%d\", &amp;id);\r\n\r\n    Task *temp = head, *prev = NULL;\r\n\r\n    while (temp != NULL &amp;&amp; temp-&gt;id != id) \r\n    {\r\n        prev = temp;\r\n        temp = temp-&gt;next;\r\n    }\r\n\r\n    if (temp == NULL) \r\n    {\r\n        printf(\"Task with ID %d not found.\\n\", id);\r\n        return;\r\n    }\r\n\r\n    if (prev == NULL) \r\n    {\r\n        head = temp-&gt;next;\r\n    } else \r\n    {\r\n        prev-&gt;next = temp-&gt;next;\r\n    }\r\n\r\n    free(temp);\r\n    printf(\"Task deleted successfully.\\n\");\r\n}\r\n\r\n\/\/ Main menu\r\nint main() \r\n{\r\n    int choice;\r\n\r\n    do \r\n    {\r\n        printf(\"\\n----- To-Do List Menu -----\\n\");\r\n        printf(\"1. Add Task\\n\");\r\n        printf(\"2. Display Tasks\\n\");\r\n        printf(\"3. Mark Task as Completed\\n\");\r\n        printf(\"4. Delete Task\\n\");\r\n        printf(\"5. Exit\\n\");\r\n        printf(\"---------------------------\\n\");\r\n        printf(\"Enter your choice: \");\r\n        scanf(\"%d\", &amp;choice);\r\n\r\n        switch (choice) \r\n        {\r\n            case 1: addTask(); break;\r\n            case 2: displayTasks(); break;\r\n            case 3: markCompleted(); break;\r\n            case 4: deleteTask(); break;\r\n            case 5: printf(\"Exiting program.\\n\"); break;\r\n            default: printf(\"Invalid choice. Try again.\\n\");\r\n        }\r\n\r\n    } while (choice != 5);\r\n\r\n    return 0;\r\n}<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Program 1 \/\/ TO DO List Project Based on Linked List #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string.h&gt; typedef struct Task { int id; char description[100]; int completed; struct Task* next; } Task; Task* head&#46;&#46;&#46;<\/p>\n","protected":false},"author":581,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24020],"tags":[24331,34845,34846,34847,22641,34850,34103,34851],"class_list":["post-145773","post","type-post","status-publish","format-standard","hentry","category-data-structure-tutorials","tag-data-structures","tag-data-structures-practical","tag-data-structures-program","tag-data-structures-project","tag-to-do-list","tag-to-do-list-in-data-structures","tag-to-do-list-project","tag-to-do-list-using-data-structures"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DSA Project - To Do List - DataFlair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/to-do-list-using-data-structures\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DSA Project - To Do List - DataFlair\" \/>\n<meta property=\"og:description\" content=\"Program 1 \/\/ TO DO List Project Based on Linked List #include &lt;stdio.h&gt; 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