File copy character by character file for c programming

#include <stdio.h> #include <conio.h> // for getch() #include <stdlib.h> // for exit() void main() { FILE *source_file, *destination_file; char ch; clrscr(); // optional: clear the screen (Turbo C specific) // Open the source file in read mode source_file = fopen("source.txt", "r"); if (source_file == NULL) { printf("Error opening source file.\n"); exit(1); } // Open the destination file in write mode destination_file = fopen("destination.txt", "w"); if (destination_file == NULL) { printf("Error opening destination file.\n"); fclose(source_file); // close source before exiting exit(1); } // Copy character by character while ((ch = getc(source_file)) != EOF) { putc(ch, destination_file); } printf("File copied successfully!\n"); // Close both files fclose(source_file); fclose(destination_file); getch(); // wait for a key press before program ends } Output

Explanation of the File Copy Program

This program is used to copy the contents of one file into another file. It reads data from a file named source.txt and writes that data into destination.txt. It uses file handling functions to open, read, write, and close files safely.

What the Program Does

• Opens the source file: The program tries to open source.txt in read mode. If it fails, it displays an error message and stops running.
• Opens the destination file: It creates or opens destination.txt in write mode. If this fails, it shows an error and exits.
• Copies the content: The program reads characters one by one from the source file and writes them to the destination file until it reaches the end of the file.
• Displays a success message: After copying completes, it prints:
  File copied successfully!
• Closes both files: The program closes the source and destination files to avoid data loss or corruption.
• Waits for a key press: In Turbo C/C++, getch() is used to pause the screen until the user presses a key.

Summary: The program safely opens two files, copies the contents from source.txt to destination.txt, shows a success message, and closes both files properly.