FILE INPUT/OUTPUT (LOAD AND SAVE)

• Where do computers store information?
• Difference between memory and disk storage

3 ways to interact with a file

1. Write to a file
2. Append to a file
3. Read from a file

WRITING DATA TO A FILE - SAVE COMMAND

• save command to write format:
• save command example:
• save command overwrites:

APPENDING DATA TO A FILE - SAVE COMMAND

• save command for appending instead of overwriting:
• save command for appending data with different columns:

READING FROM A FILE - LOAD COMMAND

• we want to load junk.dat
• load command

LOWER LEVEL FILE I/O FUNCTIONS

OPENING AND CLOSING A FILE

• fopen() function:
• fopen() format:
• fopen() example:
• fclose()

READING FROM FILES USING FGETl

• fgetl vs fgets:
• fgetl format:

WRITING AND APPENDING TO FILE

• fprintf function - to print formatted text into file:
• type function - checking the content of the resulting text file:
• setting the wrong permission:

ALTERNATE FILE INPUT FUNCTIONS

FSCANF

• fscanf function:
• file example (temperatures.txt):
• why won’t the load function work in this example?
• fgetl to read the header information:
• fscanf format: