C Program to Implement Personal Diary Management System

C

// C program to implement a simple personal diary
// application
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
 
#define MAX_ENTRY_SIZE 500
 
// Function to add a new diary entry
void addEntry()
{
    char entry[MAX_ENTRY_SIZE];
    printf(
        "Enter your diary entry (max 500 characters):\n");
    getchar(); // Consume the newline character left in the
               // buffer
    fgets(entry, sizeof(entry), stdin);
 
    // Get current date and time
    time_t t = time(NULL);
    struct tm* tm_info = localtime(&t);
    char timestamp[20];
    strftime(timestamp, sizeof(timestamp),
             "%Y-%m-%d %H:%M:%S", tm_info);
 
    // Append the entry to the diary file
    FILE* file = fopen("diary.txt", "a");
    if (file != NULL) {
        fprintf(file, "[%s]\n%s\n\n", timestamp, entry);
        fclose(file);
        printf("Entry added successfully!\n");
    }
    else {
        printf("Error: Could not open the diary file.\n");
    }
}
 
// Function to display all diary entries
void viewEntries()
{
    char line[MAX_ENTRY_SIZE];
    FILE* file = fopen("diary.txt", "r");
    if (file != NULL) {
        while (fgets(line, sizeof(line), file) != NULL) {
            printf("%s", line);
        }
        fclose(file);
    }
    else {
        printf("Error: Could not open the diary file.\n");
    }
}
 
// Driver code
int main()
{
    int choice;
 
    // loop that will run till exit is selected.
    do {
        // main dashboard
        printf("\nPersonal Diary Application\n");
        printf("1. Add Diary Entry\n");
        printf("2. View Diary Entries\n");
        printf("3. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
 
        // choice selection
        switch (choice) {
        case 1:
            addEntry();
            break;
        case 2:
            viewEntries();
            break;
        case 3:
            printf("Exiting the diary application. "
                   "Goodbye!\n");
            break;
        default:
            printf("Invalid choice. Please enter a valid "
                   "option.\n");
        }
    } while (choice != 3);
 
    return 0;
}

Output

Main Menu Output

Entering and Viewing Entries

Exiting the Application

Simple Personal Diary Management System in C

Keeping a personal diary has been a timeless practice for a lot of individuals to reflect on their thoughts and experiences. In this article, we will look at a simple personal diary management application in C.

Prerequisite: Basic C Knowledge, File Handling in C, and Time in C.

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C // C program to implement a simple personal diary // application #include #include #include #include #define MAX_ENTRY_SIZE 500 // Function to add a new diary entry void addEntry() { char entry[MAX_ENTRY_SIZE]; printf( "Enter your diary entry (max 500 characters):\n"); getchar(); // Consume the newline character left in the // buffer fgets(entry, sizeof(entry), stdin); // Get current date and time time_t t = time(NULL); struct tm* tm_info = localtime(&t); char timestamp[20]; strftime(timestamp, sizeof(timestamp), "%Y-%m-%d %H:%M:%S", tm_info); // Append the entry to the diary file FILE* file = fopen("diary.txt", "a"); if (file != NULL) { fprintf(file, "[%s]\n%s\n\n", timestamp, entry); fclose(file); printf("Entry added successfully!\n"); } else { printf("Error: Could not open the diary file.\n"); } } // Function to display all diary entries void viewEntries() { char line[MAX_ENTRY_SIZE]; FILE* file = fopen("diary.txt", "r"); if (file != NULL) { while (fgets(line, sizeof(line), file) != NULL) { printf("%s", line); } fclose(file); } else { printf("Error: Could not open the diary file.\n"); } } // Driver code int main() { int choice; // loop that will run till exit is selected. do { // main dashboard printf("\nPersonal Diary Application\n"); printf("1. Add Diary Entry\n"); printf("2. View Diary Entries\n"); printf("3. Exit\n"); printf("Enter your choice: "); scanf("%d", &choice); // choice selection switch (choice) { case 1: addEntry(); break; case 2: viewEntries(); break; case 3: printf("Exiting the diary application. " "Goodbye!\n"); break; default: printf("Invalid choice. Please enter a valid " "option.\n"); } } while (choice != 3); return 0; }...

C Program to Implement Personal Diary Management System

C

Simple Personal Diary Management System in C

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