CODEWITHSUNDEEP
c
user2872131
user2872131

Reputation: 83

Is there a way to initialize a file that hasnt been read yet in c

For my project we are supposed to read a file and copy it in reverse. The part I am stumped on is how I can get the program to read the file off the command line, because I have no idea what file will be used to test this, and I don't have the given txt file. Is there a way to assign a variable to file that hasn't been declared yet and to create a new file that shows the reverse txt? Sorry if this is not clear, I will try to make it as clear as possible if you need me to.

Upvotes: 3

Views: 95

Answers (2)

Gangadhar
Gangadhar

Reputation: 10516

From command line you can pass file to write some thing and file which will be reversed

Your program looks like  

int main(int argc,char *argv[] )
{
//...
return 0;
}

compile 

  gcc program.c -o out

You need to pass files like this 

 ./out file_to_write file_to_write_in_reverse

------------------------------------------------------------or---------------------------------------------------------------------

In Your Program

use fgets() and read file name of file_to_write

You can create a file.

 fopen()+ w+ mode

Write data, for example write string into file

`fprintf()` or `fputs()`

use fgets() and read another file name of file_to_write_in_reverse

create file_to_write_in_reverse

fopen()+ w mode

and now Use fseek(), fgetc() and fputc()

Upvotes: 0

Jet
Jet

Reputation: 43

You pass the file name in using the argv[] array that is declared when you create main. Because fopen in C takes a char, or char array you can then open the file specified through the command line. For all the information you should need regarding this use the site I link.

http://www.cprogramming.com/tutorial/c/lesson14.html

Upvotes: 1

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