Using Structures write an interactive program in C language to create an application program for a small training company to maintain the Trainer's database. This application should be having menu options like

Creating a New Record

Reading/Listing of Records

Modify the record

Delete the record

Each Trainer record should have Trainer Name, Trainer ID, Department Name, Salary, Position, Date of Joining, etc.). The application should be designed user-friendly.

Here is a C program using structures and file handling to manage a trainer's database with options to create, read, modify, and delete records.  

```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define FILE_NAME "trainers.dat"

struct Trainer {
    int id;
    char name[50];
    char department[50];
    float salary;
    char position[50];
    char date_of_joining[15];
};

void addTrainer() {
    FILE *file = fopen(FILE_NAME, "ab");
    struct Trainer t;
    printf("\nEnter Trainer ID: ");
    scanf("%d", &t.id);
    printf("Enter Trainer Name: ");
    scanf(" %[^\n]", t.name);
    printf("Enter Department Name: ");
    scanf(" %[^\n]", t.department);
    printf("Enter Salary: ");
    scanf("%f", &t.salary);
    printf("Enter Position: ");
    scanf(" %[^\n]", t.position);
    printf("Enter Date of Joining (DD/MM/YYYY): ");
    scanf(" %[^\n]", t.date_of_joining);

    fwrite(&t, sizeof(t), 1, file);
    fclose(file);
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