read from file question

[Arquitecto]

Hi ,

I have a question about a file operation i want to do . I have a data
file lets say X bytes . I want to read the file and delete a byte
every 2nd byte . I am a little comfused ,my approach is like this .

main()
{
char buf[1024];
FILE *fp;
fp=fopen("data" , "rb");

while(!feof(fp) ) {
fread(buf, 1, 1, fp);
}

fclose(fp);
}

ok ,with this i can read 1 byte at a time till end .Now what i want to
do is .... i want to have on buf the 1 byte ,3rd byte .. 5th .. etc
and discard 2nd .. 4th ...etc .My thought was to take the position of
the file pointer ,
example : position= ftell(fp) and if position % 2 == 0 then do not
read ..

but i dont know if i am on right way or is a correct way to do what i
want .I will appreciate comments on how to approach it . thanks in
advance .

[CBFalconer]

Arquitecto wrote:

>
I have a question about a file operation i want to do . I have a
data file lets say X bytes . I want to read the file and delete a
byte every 2nd byte . I am a little comfused ,my approach is like
this .

.... snip code ...

Try opening an input and output file (or use stdin and stdout) and:

int n, ch;

n = 1;
while (EOF != (ch = getchar())) {
n = -n;
if (n < 0) putchar(ch);
}

Then close the files. Note that ch is an int. This is only a
snippet. Look up fopen and fclose, also stdio.h. Test fopen for
success, also fclose if you are going to destroy the original file.

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