Thread: Digital to Binary

I'm trying to figure out how to add the 0's in front of the binary out put.

ie: when I enter 23 I get 10111 I would like it to read 00010111 or 0001 0111

Thanks for any help you can give me on this.

Code:

#include <stdio.h>
#include <conio.h>

int main(void)
{
    long b[20], n, r, c = 0, i ;
    printf("Enter a decimal number: ");
    scanf("%ld", &n) ;

    if(n <= 0 || n > 255)
    {
        printf("Only numbers between 1 - 255");
        return 1;
    }
    while(n > 0)
    {
        r = n % 2 ;
        b[c] = r ;
        n = n / 2 ;
        c++ ;
    }
    printf("The binary equivalent is : ");

    for(i = c - 1 ; i >= 0; i--)
    {
        printf("%ld", b[i]) ;
    }
}