How do you empty a file using C programming?

Answer 1

That depends on the type of file and what you mean by "empty". Generally, fopen() called on an existing file, with the "w" option instead of the "a" option will truncate the file to zero length. To delete a file completely is a different process. Function truncate is your friend.

Answer 2

opening the file in write mode will erase the contents.

fopen("myfile.txt","w");