Write a program to print Series by user in c

#include
#include
main()
{
int f=0,f1=1,f2=0,n;
clrscr();
printf("Enter fast range");
scanf("%d",&n);
while(f1 {
printf("%d",f2);
f=f1+f2;
f1=f2;
f2=f;
}
getch();
}

OUTPUT

Enter fast range : 5
0 1 1 2 3 5