Decimal is output in binary form in the C language

In the C language we usually have such a statement,
No matter how it is written, it depends on how we read it.
For example, printing out a variety of forms of shaping is
printf ("%o\n", a); octal
printf ("%n\n", a); decimal
printf ("%x\n", a); hex


Except that the binary is not printed
The following code shows the printed positive binary form

#include <stdio.h>void f (int n) {if (n) f (N/2); else return; printf ("%d\n", n%2);} int main (void) {int n; while (1) { scanf ("%d", &n); if (n<0) break; if (n==0) printf ("0"); f (n); printf ("\ n"); } return 0;}

Decimal is output in binary form in the C language