Write a C Program to copy the contents of a file to another

When you run the program, it shows: enter the content of the file, press cntrl+z when finish File 1 ➞ File 2 the content of the copied file: File 1 Step-by-step meaning: enter the content... → Program asks you to type text for File 1 (input). File 1 ➞ File 2 → This is the text you typed; it’s stored inside the input file. the content of the copied file → Printed by the program before showing copied data. File 1 ➞ File 2 → The same content displayed again, this time read from File 2 (output). Notice there’s no line break between the content of the copied file and your copied text — because the program’s printf() doesn’t include \n.

//FILE COPY.CPP #include<stdio.h> #include<conio.h> void main() { FILE *fp, *fp1; char ch; clrscr(); fp=fopen("input", "w"); printf("\n enter the content of the file, press cntrl+z when finish \n"); while((ch=getchar())!=EOF) putc(ch, fp); fclose(fp); fp=fopen("input","r"); fp1=fopen("output", "w"); while((ch=getc(fp))!=EOF) putc(ch, fp1); fcloseall(); fp1=fopen("output", "r"); printf("the content of the copied file: "); while((ch=getc(fp1))!=EOF) printf("%c", ch); fclose(fp1); getch(); }

🧠 Output Explanation

When you run the program, it shows:

enter the content of the file, press cntrl+z when finish 
File 1 ➞ File 2 
the content of the copied file: File 1

Step-by-step meaning:

1. enter the content... → Program asks you to type text for File 1 (input).
2. File 1 ➞ File 2 → This is the text you typed; it’s stored inside the input file.
3. the content of the copied file → Printed by the program before showing copied data.
4. File 1 ➞ File 2 → The same content displayed again, this time read from File 2 (output).

Notice there’s no line break between the content of the copied file and your copied text — because the program’s printf() doesn’t include \n.

⚙️ Extra Points (Advanced Concepts)

• clrscr() → Clears the Turbo C screen (non-standard, used for visual reset).
• (ch = getchar()) != EOF → Reads every character until Ctrl+Z (end of input).
• putc(ch, fp) → Writes each character directly to file (efficient).
• fcloseall() → Turbo C–specific function that closes all open files (not ANSI C standard).
• Copy Process: while((ch=getc(fp))!=EOF) putc(ch, fp1); → Copies input to output exactly, preserving formatting.
• Output Formatting Issue → Missing \n causes continuous line display.
• getch() → Keeps the output window open until a key is pressed.

🧾 In Short

Stage	File	Purpose
1. Input	input	You type data here (File 1)
2. Copy	output	Program duplicates input into this file (File 2)
3. Display	Console	Shows copied content from File 2

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