To-Do List Application in C

 2. To-Do List Application

Description: Build a simple command-line to-do list application that allows users to add, view, and delete tasks.

Key Features:

• Add tasks with a description.
• View all tasks.
• Delete tasks by index.

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define MAX_TASKS 100

#define TASK_LENGTH 100

char tasks[MAX_TASKS][TASK_LENGTH];

int task_count = 0;

void add_task(const char *task) {

    if (task_count < MAX_TASKS) {

        strcpy(tasks[task_count], task);

        task_count++;

    } else {

        printf("Task list is full!\n");

    }

}

void view_tasks() {

    if (task_count == 0) {

        printf("No tasks available.\n");

        return;

    }

    for (int i = 0; i < task_count; i++) {

        printf("%d: %s\n", i + 1, tasks[i]);

    }

}

void delete_task(int index) {

    if (index < 1 || index > task_count) {

        printf("Invalid task number!\n");

        return;

    }

    for (int i = index - 1; i < task_count - 1; i++) {

        strcpy(tasks[i], tasks[i + 1]);

    }

    task_count--;

}

int main() {

    int choice;

    char task[TASK_LENGTH];

    while (1) {

        printf("\n1. Add Task\n2. View Tasks\n3. Delete Task\n4. Exit\n");

        printf("Enter your choice: ");

        scanf("%d", &choice);

        getchar(); // Consume newline

        switch (choice) {

            case 1:

                printf("Enter task: ");

                fgets(task, TASK_LENGTH, stdin);

                task[strcspn(task, "\n")] = 0; // Remove newline

                add_task(task);

                break;

            case 2:

                view_tasks();

                break;

            case 3:

                printf("Enter task number to delete: ");

                int task_num;

                scanf("%d", &task_num);

                delete_task(task_num);

                break;

            case 4:

                exit(0);

            default:

                printf("Invalid choice!\n");

        }

    }

    return 0;

}