Interactive Computer Science Tutoring
Learn programming concepts interactively
C File I/O - Digital Filing Cabinet!
Master file operations with interactive reading, writing, and error handling
Virtual File System
Available files in the system
data.txt
3 lines • CLOSED
numbers.txt
4 lines • CLOSED
File Mode Selection
Choose how to open files
Create New File
Add a new file to the virtual file system
File I/O Code
Interactive C code with memory visualization
File Operation Log0/5
Recent operations with timestamps
No operations yet
Start by adding or modifying elements
Common File Operations
fopen()⚠️
Open a file for reading or writing
FILE *file = fopen("data.txt", "r");
fclose()✅
Close an open file
int result = fclose(file);
fprintf()✅
Write formatted data to file
fprintf(file, "Number: %d\n", 42);
File I/O Safety
🔴 Always check fopen() return value
File operations can fail. Always check if fopen() returns NULL.
🟡 Use fgets() instead of fscanf()
fgets() is safer for reading strings as it prevents buffer overflows.
🟢 Always close files with fclose()
Properly closing files prevents resource leaks and ensures data is written.