File I/O in C

0:05 - FILE pointers
1:00 - Opening files for reading & writing (fopen)
1:36 - Reading an input file line by line (fgets)
4:02 - Writing a function to remove the training newline read by gets
7:55 - Writing a formatted output string to a file (sprintf / fputs)
9:27 - Writing a function to add the ASCII value of each character in a string
10:52 - Compiling & testing
12:31 - Closing the files (fclose)
12:57 - Reopening a file
13:23 - Reading a file character-by-character (getc)