regarding feof() function.
 

following is my code.

#include<stdio. h>
main() {
FILE *s,*d;
char a[60];
s=fopen("temp" ,"r");
while(!feof( s)) {
fgets(a,55,s) ;
printf(" %s is the string in the temp file\n",a);
}
}

output:

$ ./a.out
hsuresh is a good boy.
is the string in the temp file
hsuresh is a good boy.
is the string in the temp file

tempfilecontents:
[vskumar@dotools files]$ cat temp
hsuresh is a good boy.

------------ --------- --------- ----

Why the contents of the file temp is getting printed twice?

Pull the printf out of your while loop and it should work:

See here: http://en.wikipedia.org/wiki/Fgets
Looks like you've got a blank line after your text line. fgets stops reading at new-line character, so it'll read the blank line, but put nothing into 'a', so you'll get the same content again.

fgets returns null if a line cannot be read. You should check for this.


feof can only see that the end of file has been reached after you attempt to read beyond the end of the file.

From feof documentation:

Checks whether the End-of-File indicator associated with stream is set, returning a value different from zero if it is.
This indicator is generally set by a previous operation on the stream that reached the End-of-File.