2 questions about file manipulation

Hello everyone;

First question; how do you DELETE a file using C commands?

Second question; how can you encrypt a file so it is not readable by any means other than your program?

hi if you want to delete a file using c function from hard disk, it is not possible because u need to know your os' filesystem

when u want to encrypt, that is just read the file word by word or char by char and apply any good encryption algorithm....

bye

You can delete file using C command "remove(file)".

For the encryption, this is an option:

At first you read the whole file using command "fscanf" until the EOF is found. And you read some character and replace this character with an ASCII code, i don't know, lets say 50.

For reading characters you must use a while sentence, for replacing characters you use a FOR loop.

That's all.

you could always use 'system'

system("rm -rf file");

note that this only works with unix.

you could also set up some macros and define the os at
compile-time:

#if defined UNIX
# define DEL "rm -rf"
#elif defined WINDOWS
# define DEL "del"
#elif defined MAC
# define DEF "mac's dumb, doesn't have a console" \
"and therefore no system calls"
#endif

now delete by calling system:
system(DEL "file");

you'll need stdlib.h for 'system'