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language

for

beginners

youtube

lesson

tutorial

lectures

arrays

functions

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how

to

learn

education

class

C (Programming Language)

C File Input/output

Writing (Interest)

c

write

file

00:00:02

all right let's do this here's how we

00:00:04

can write to a file in c let's create a

00:00:07

file pointer the data type is file and

00:00:10

i'll name this pf it's a pointer to a

00:00:13

file and i will set this equal to then

00:00:16

invoke the f open function we will pass

00:00:19

in a name we would like to give our file

00:00:22

let's name this test.txt

00:00:24

but if you would like this to be a

00:00:26

different file extension such as html

00:00:28

well you can change it to that then uh

00:00:30

we'll keep this as a plain text file

00:00:32

just to keep it simple and to write to a

00:00:35

file there is a second argument a mode

00:00:38

so this could be w for right a for

00:00:41

append r for read but we are looking for

00:00:44

w for now so it is good practice at the

00:00:47

end of your program to close any files

00:00:49

that are open so we will use the f close

00:00:53

function and pass in our pointer p f

00:00:57

make sure to not dereference it now to

00:00:59

write a line of text to our file we can

00:01:01

use f print f

00:01:04

pass in our pointer p f do not

00:01:07

dereference it and then some string of

00:01:09

text let's say spongebob squarepants

00:01:13

so this file will be created in the same

00:01:16

folder as my c program so after running

00:01:19

this

00:01:20

we have a new text file within the same

00:01:22

folder and it says spongebob squarepants

00:01:26

what if i run this again and write

00:01:27

something different like patrick

00:01:30

starr

00:01:32

so if the mode is w

00:01:34

then we will actually overwrite any

00:01:36

existing data already within this file

00:01:39

if we need to append a file we can use

00:01:42

the a mode for append so this time let's

00:01:45

append some text to the end of our

00:01:46

document

00:01:49

spongebob squarepants

00:01:52

and you'll have to keep track of any new

00:01:54

lines that you add too so if i run this

00:01:56

again and this time i am appending some

00:01:58

text

00:02:01

well patrick star is still there and we

00:02:03

appended spongebob squarepants to the

00:02:05

end of our file

00:02:07

now if you would like to delete a file

00:02:09

here's how i'm going to turn all of this

00:02:11

into one giant comment

00:02:14

let's use a little bit of file detection

00:02:16

let's check to see if our file does

00:02:18

exist

00:02:20

within our if statement let's invoke the

00:02:22

remove method and we will pass in the

00:02:25

name or location to our file

00:02:28

test.txt if we remove this file

00:02:30

successfully it will return zero so if

00:02:34

after invoking the remove function if

00:02:36

this returns zero that's its exit code

00:02:39

that means that file was deleted

00:02:41

successfully let's print a message to

00:02:43

let the user know

00:02:45

that

00:02:46

file

00:02:47

was deleted

00:02:50

successfully

00:02:52

else we will print a different message

00:02:54

printf

00:02:57

that file was not

00:02:59

deleted

00:03:00

okay let's try this so here's my file

00:03:03

within the same folder if i run this

00:03:06

that file was deleted successfully and

00:03:09

that file is no longer within the same

00:03:11

folder you can see here that this says

00:03:13

deleted

00:03:14

and if i run this again we will not be

00:03:15

able to locate that file because it's

00:03:17

not there

00:03:18

now you can write a file to a different

00:03:20

location let's say i would like to write

00:03:23

a file to my desktop i can set a

00:03:25

relative file path or an absolute file

00:03:28

path i'll use an absolute file path

00:03:31

i'm going to get the file location of my

00:03:33

desktop so i'm just going to click on

00:03:35

one of these folders

00:03:37

go to properties

00:03:39

and copy this location

00:03:42

so with my file name i'm going to

00:03:44

precede this with an absolute file path

00:03:47

then any backslashes might need to be

00:03:50

double backslashes

00:03:51

so this time if i write a file

00:03:54

then this file will appear at this

00:03:56

location on my desktop

00:03:58

and here's that file

00:04:00

test.txt and it says spongebob

00:04:03

squarepants

00:04:04

well alright everybody that is how to

00:04:06

write append and delete files in c if

00:04:09

you found this video helpful be sure to

00:04:11

help me out by smashing that like button

00:04:14

leave a random comment down below and

00:04:16

subscribe if you'd like to become a

00:04:17

fellow bro

Description:

C write append delete file tutorial example explained int main() { // WRITE/APPEND A FILE FILE *pF = fopen("C:\\Users\\Cakow\\Desktop\\test.txt", "w"); fprintf(pF, "Spongebob Squarepants"); fclose(pF); // DELETE A FILE /* if(remove("test.txt") == 0) { printf("That file was deleted successfully!"); } else { printf("That file was NOT deleted!"); } */ return 0; }

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