C++ : Menukar Nilai Heximal Kepada Binari

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

int main()
{
    int d,n,i,j,a[50];

    printf("Enter a number:");
    scanf("%d",&n);

    if(n==0)
        printf("\nThe binary conversion of 0 is 0");
    else
        {
            printf("\nThe binary conversion of %d is 1",n);

        for(i=1;n!=1;++i)
        {
            d=n%2;
            a[i]=d;
            n=n/2;
        }
        for(j=i-1;j>0;--j)
            printf("%d",a[j]);
        }
        getch();
    return (0);
}