How to print binary number via printf [duplicate]

Question

Possible Duplicate:
Is there a printf converter to print in binary format?

Here is my program

#include<stdio.h> int main () {     int i,a=2;     i=~a;     printf("a=%d\ni=%d\n",a,i);      return 0; } 

The output is

a=2 i=-3 

I want this to print in binary. There are %x, %o, and %d which are for hexadecimal, octal, and decimal number, but what is for printing binary in printf?

Answer 1

printf() doesn't directly support that. Instead you have to make your own function.

Something like:

while (n) {     if (n & 1)         printf("1");     else         printf("0");      n >>= 1; } printf("\n");