C programme for fibnocci series between limits

#include <stdio.h>
#include <conio.h>
 main()
{
int i,n1,n2,f1-=0,f2=1,f3;
printf("enter limits");
scanf("%d%D"<&n1,&n2);
do
{
f3=f1+f2;
if((f3>=n1)&&(f3<=n2))
printf("%d\n",f3);
f1=f2;
f2=f3;
}
while(f3<=n2);
getche();
}