to calculate binary value of given number

#include<stdio.h>
#include<conio.h>
main()
{
int a[10],i,b,j,c;
char h[16]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E'};
clrscr();
printf("enter number");
scanf("%d",&b);
for(i=0;b>0;i++)
{
a[i]=b%2;
b=b/2;
}
printf("binary number is\n");
for(i--;i>=0;i--)
{
printf("%d",a[i]);
}
getch();
return 0;
}