| 9.8.3. Storing strings in a file (with fwrite) | ||
|---|---|---|
 | 9.8. Activities |  |
| 9.8.3. Storing strings in a file (with fwrite) | ||
|---|---|---|
| | 9.8. Activities | |
Section 3 from Reading and writing with files
Write a program with name
fwrite_getline.c (which you will find in your
folder fwrite) that implements the
following operations:
Check the program is started with a single argument. If that is not the case, print a message and terminate.
Open the file using as name the argument given to the program. If the operation fails, notify with a message and terminate the execution.
Asks the user for a string or CTRL+D to finish the
program (it will use the getline function).
Calculate the actual size of the string (with
strlen) and store its size and the string itself,
using the fwrite function. When users desire to
finish the program, they must enter CTRL+D.
The program checks the CTRL-D condition, looking the
return value of getline (read about
getline in its manual page).
The function getline executes
internally a malloc (if the user does not do it
explicitly); therefore, the number of calls to free
must be identical to the calls to malloc.
Close the file and if the operation produces an error, notify it with a message on the screen.
Upload the program to the folder
fwrite in your workspace in
Subversion.
| |  | |
| 9.8.2. Recovering strings from a file (with fread) |  | 9.8.4. Read a text file and, count its characters and write the counter in another file |