Rename file problem

i am trying to fix a problem with renaming a file function using rename
it will open file called "Country.txt" then search in deletecode field for "N" then save it in a new file"Temporary file" then have to rename "Country file to Backup file".
i don't know what the problem is
could you help me to fix this problem
Thanks

Code:

#include <stdio.h>
#include<string.h>
#include<stdlib.h>
#include <ctype.h>
#include"rename.h"

void backu();

struct Country
{
	 int position;
	char country[3],name[16];
	 char intcode[4];
	 char deletecode[2];
	
};
void main()
//void DeleteCountry()
{

int ch,result;
char ch1;
int e,i,count;

bool check,test;
FILE *f;
struct Country c;
system("cls");

      f=fopen("a:\\Country.txt","r+");//
      i=0;
      count=0;
      while(fread(&c,sizeof(c),1,f)==1)
     {
                    puts(c.deletecode);
	ch=strcmp(c.deletecode,"N");
	if (ch==0)
	{
	f=fopen("a:\\CountryTemporary.txt","a+");//
		  
	struct Country temp[i];
	 printf("I:%d\n",i);
	strcpy(temp[i].country,c.country);
	strcpy(temp[i].name,c.name);
	strcpy(temp[i].intcode,c.intcode);
	strcpy(temp[i].deletecode,c.deletecode);
	temp[i].position=c.position;
		 		
	//fwrite(&temp,sizeof(temp),1,f);
	 //fclose(f);
	puts(temp[i].country);
	puts(temp[i].name);
	i++;
	}
	count++;
   }

 /* Attempt to rename file: */
   result = rename( "Country.txt", "CountryBackup.txt" );
   if( result != 0 )
      printf( "Could not rename " );
   else
      printf( "File  renamed to " );

}

I thik it's not renaming the file because the file is still open...I'm not sure though

>void main ()
wrong, main returns an int, so use int main(void)

>f = fopen("a:\\Country.txt", "r+");
You should check that the open worked before using f.
If you are reading structs, you should use a binary mode.

>f = fopen("a:\\CountryTemporary.txt", "a+");
Why have you opened a new file with f, without first closing the original f?

>struct Country temp[i];
You can't declare variables in the middle of a function.
i is set to zero, so you aren't creating any array indexes anyway.

And no, you cannot rename a file that is in use.