Decimal(2) To Binary(0,1)

#include
#include
#include
void main()
{
int n=12,n1,i=0,r,j;
int a[20];
n1=n;
clrscr();
while(n!=0)
{
r=n%2;
n=n/2;
a[i]=r;
i++;
}
printf("\nDecimal(2) %d Equalent Binary(0,1) is ",n1);
for(j=i;j>=0;j--)
printf("%d",a[j]);
getch();
}
Output
Decimal(2) 12 Equalent Binary(0,1) is 01100