Need to work on an assignment in C for the following.

1. Changing the size of the cursor
2. Placing the cursor at an appropriate position on screen.
3. Drawing any graphics shape on the screen
4. Receiving a key from the keyboard
5. Checking the memory size of the computer
6. Finding out the list of equipments attached to the computer
7. Formatting a floppy
8. Hiding a file from the directory
9. Displaying the directory of a disk

Pls, help with sample codes for this or point to URL where I can find help

Your question can't be answered with the information given. All of those tasks are non-portable and depend heavily on your OS and compiler.