C File Input/Output | C File Input/Output | Selection With Sathi

📚 C File Input/Output | C File Input/Output
fopen, fclose, text & binary file operations for developers and students

📌 Key Formulas:
1. fopen Modes: r (read) | w (write) | a (append) | rb/wb (binary)
2. fprintf / fscanf: fprintf(fp, "format", args) | fscanf(fp, "format", &args)
3. fread / fwrite (Binary I/O): fread(ptr, size, count, fp) | fwrite(ptr, size, count, fp)
4. fseek / ftell / rewind: fseek(fp, offset, origin) | ftell(fp) | rewind(fp)

⏱️ Timestamps:
0:00 Introduction
0:20 fopen Modes
1:05 fprintf / fscanf
1:45 fread / fwrite (Binary I/O)
2:34 fseek / ftell / rewind
3:23 Write Text File
3:52 Read File Line by Line
4:26 Binary File Read/Write
5:03 File Copy Program
5:40 Quick Tips & Tricks | टिप्स
6:12 Summary | सारांश

💡 Quick Tips:
• Always check fopen return value for NULL — file might not exist or you might lack permissions
• Always fclose files when done — unclosed files can cause data loss and resource leaks
• "w" mode truncates existing files to zero — use "a" to append without destroying data
• File size trick: fseek(fp, 0, SEEK_END); long size = ftell(fp); rewind(fp); — gives file size in bytes

📚 Useful for: C Programming, GATE CSE, Interviews and all govt exams

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