How to replace a character in a file in C

Asked Dec 20 '16 at 21:01

Active Dec 20 '16 at 21:05

Viewed 72 times

i'm trying to find the occurences of a particular character in a text file , then replace it with another one . I've tried something like this `

c=fgetc(f1);
while(c!=EOF)
{

    if(c=='s')
    {
        fprintf(f1,"c");
    }
    c=fgetc(f1);
}

asked Dec 20 '16 at 21:01

gaston_n

It is necessary to back the position of the file. – BLUEPIXY Dec 20 '16 at 21:04
No, you can't do that. Partial code posted, but at best you will overwrite the *next* character in the file, and then read the *following* one after that. The file pointer moves on after each access. – Weather Vane Dec 20 '16 at 21:05
I'd copy the file to a temporary file, replacing the characters and then delete the original file and finally rename the temporary file to the original file. – Jabberwocky Dec 20 '16 at 21:05
1

that's a waste @MichaelWalz especially if it's a big file, he can do what he wants, just needs to see the linked duplicate question – Keith Nicholas Dec 20 '16 at 21:06
@WeatherVane that's exactly what happened , i've lost a character . – gaston_n Dec 20 '16 at 21:15
Please see @BLUEPIXY – Weather Vane Dec 20 '16 at 21:18

0 Answers0