C program to display the alternate characters from an existing file

Write a ‘C’ program to display the alternate characters from an existing file.

#include<stdio.h>
#include<conio.h>
void main()
{
FILE *fp;
char ch;
int i=0;
clrscr();
fp=fopen("a.txt","r");
if(fp==NULL)
{
printf("\nFILE DOES NOT EXIST");
exit(0);
}
while(1)
{
ch=fgetc(fp);
if(ch==EOF)
 break;
if(i%2==0)
{
printf("%c",ch);
}
i++;
}
fclose(fp);
getch();
}