Decimal to Binary in C language

#include <stdio.h>
#include <math.h>

void main()
{
    long int d_n, rem, b_n = 0, base=1;
    printf("Enter a decimal number : ");
    scanf("%ld",&d_n);
    printf("\n\n\nYour entered decimal number is : %ld",d_n);
    while(d_n!=0)
    {
        rem=d_n%2;
        b_n+=rem*base;
        base*=10;
        d_n/=2;
    }

    printf("\nYahoo Your entered decimal number is converted into binary");
    printf("\nAnd the number is : %ld",b_n);

    return 0;
}