File Management System in C - Digital College Library

Introduction – File System

In the Article, we are going to create a File Management System in C Language. This system allow users to create, read, write and delete files using a menu-driven interfaces. And this Project is the boost the logic knowledge of C Language.

Output – File System

Structure of the Project

In the structure of the project code section you get complete explanation about the project codes,

Part – 1 Header Files and Function Prototype

#include <stdio.h>
#include <stdlib.h>

void createFile(char *filename);
void readFile(char *filename);
void writeFile(char *filename);
void deleteFile(char *filename);

The ‘stdio,h’ header file is included for standard input and output operations.
The ‘stdlib.h’ header file is included for the ‘exit()’ function.
Function Prototype are declared for the handling functions, indicating their signatures.

C Language Free Notes

Part – 2 File Handling Functions

Here are the three File handling Functions which we used in our project.

a. ‘createFile (char *filename)’

void createFile(char *filename) {
    FILE *file = fopen(filename, "w");
    if (file == NULL) {
        printf("Error: Unable to create file.\n");
        return;
    }
    fclose(file);
    printf("File '%s' created successfully.\n", filename);
}

The function creates a new file with the specified filename.
It uses ‘fopen()’ to open the file in write mode (“w”).
If the file Pointer is ‘NULL’, it indicates an error in the file creation.
Otherwise, it closes the file using ‘fclose()’ and display a success massage.

b. ‘readFile(char *filename)’

void readFile(char *filename) {
    FILE *file = fopen(filename, "r");
    if (file == NULL) {
        printf("Error: Unable to open file.\n");
        return;
    }
    char ch;
    printf("Contents of file '%s':\n", filename);
    while ((ch = fgetc(file)) != EOF) {
        putchar(ch);
    }
    fclose(file);
}

This function reads the contents of an existing file.
It uses “fopen()’ to open the file in read mode (“r”).
If the file pointer is ‘NULL’, it indicates an error in file opening.
It read characters from the file using ‘fgetc()’ until ‘EOF’ (end of file) is reached.
It closes the file using ‘fclose()’ after reading.

c. ‘writeFile (char *filename)’

void writeFile(char *filename) {
    FILE *file = fopen(filename, "a");
    if (file == NULL) {
        printf("Error: Unable to open file.\n");
        return;
    }
    printf("Enter text to write to file (press Ctrl+D to end):\n");
    char ch;
    while ((ch = getchar()) != EOF) {
        fputc(ch, file);
    }
    fclose(file);
    printf("Text written to file '%s' successfully.\n", filename);
}

This function appends text to an existing file.
it uses “fopen” to open the file in append mode (“a”).
if the File Pointer is ‘NULL’, it indicates an error in file opening.
It reads characters from the standard input (‘getchar()’) until “EOF” is reached.
it writes characters to the file using “fputc()”.
It closes the file after writing and displays a success message.

d. ‘deleteFile(char *filename)’

void deleteFile(char *filename) {
    if (remove(filename) == 0) {
        printf("File '%s' deleted successfully.\n", filename);
    } else {
        printf("Error: Unable to delete file.\n");
    }
}

The Function deletes an existing file.
It uses the “remove()” function to delete the file.
If deletion is successful (‘remove()’ returns ‘0’), it displays a success message.
Otherwise, it indicates an error in file deletion.

Part – 3 Main Function

int main() {
    char filename[100];
    int choice;

    // Display menu
    printf("Simple File Management System\n");
    printf("1. Create File\n");
    printf("2. Read File\n");
    printf("3. Write to File\n");
    printf("4. Delete File\n");
    printf("5. Exit\n");
    printf("Enter your choice: ");
    scanf("%d", &choice);

    switch (choice) {
        case 1:
            printf("Enter filename to create: ");
            scanf("%s", filename);
            createFile(filename);
            break;
        case 2:
            printf("Enter filename to read: ");
            scanf("%s", filename);
            readFile(filename);
            break;
        case 3:
            printf("Enter filename to write: ");
            scanf("%s", filename);
            writeFile(filename);
            break;
        case 4:
            printf("Enter filename to delete: ");
            scanf("%s", filename);
            deleteFile(filename);
            break;
        case 5:
            printf("Exiting...\n");
            exit(0);
        default:
            printf("Invalid choice.\n");
    }

    return 0;
}

This main function is serves as the entry point of the program.
It displays a menu of options for file management operations.
It reads the user’s choice using ‘scanf()’ and performs the corresponding operations.
Depending on the user’s choice, it calls the appropriate file handling function.
The program exits gracefully if the user chooses to exit.

Complete Codes of Project

Here is the complete codes of the Project File Management System which we creates in C Language,

#include <stdio.h>
#include <stdlib.h>

void createFile(char *filename) {
    FILE *file = fopen(filename, "w");
    if (file == NULL) {
        printf("Error: Unable to create file.\n");
        return;
    }
    fclose(file);
    printf("File '%s' created successfully.\n", filename);
}

void readFile(char *filename) {
    FILE *file = fopen(filename, "r");
    if (file == NULL) {
        printf("Error: Unable to open file.\n");
        return;
    }
    char ch;
    printf("Contents of file '%s':\n", filename);
    while ((ch = fgetc(file)) != EOF) {
        putchar(ch);
    }
    fclose(file);
}

void writeFile(char *filename) {
    FILE *file = fopen(filename, "a");
    if (file == NULL) {
        printf("Error: Unable to open file.\n");
        return;
    }
    printf("Enter text to write to file (press Ctrl+D to end):\n");
    char ch;
    while ((ch = getchar()) != EOF) {
        fputc(ch, file);
    }
    fclose(file);
    printf("Text written to file '%s' successfully.\n", filename);
}

void deleteFile(char *filename) {
    if (remove(filename) == 0) {
        printf("File '%s' deleted successfully.\n", filename);
    } else {
        printf("Error: Unable to delete file.\n");
    }
}

int main() {
    char filename[100];
    int choice;

    printf("Simple File Management System\n");
    printf("1. Create File\n");
    printf("2. Read File\n");
    printf("3. Write to File\n");
    printf("4. Delete File\n");
    printf("5. Exit\n");
    printf("Enter your choice: ");
    scanf("%d", &choice);

    switch (choice) {
        case 1:
            printf("Enter filename to create: ");
            scanf("%s", filename);
            createFile(filename);
            break;
        case 2:
            printf("Enter filename to read: ");
            scanf("%s", filename);
            readFile(filename);
            break;
        case 3:
            printf("Enter filename to write: ");
            scanf("%s", filename);
            writeFile(filename);
            break;
        case 4:
            printf("Enter filename to delete: ");
            scanf("%s", filename);
            deleteFile(filename);
            break;
        case 5:
            printf("Exiting...\n");
            exit(0);
        default:
            printf("Invalid choice.\n");
    }

    return 0;
}

Conclusion

So In this Articles, we completely learned about the How File Management System created in C Language. And how the logics works in this for creating a File Management System in C.

Build a File Management System in C Language

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