Write a C Program to convert a Decimal number to Binary Number

#include <stdio.h>
#include <conio.h>
void main()
{
 int a,b,no[100],i,c,n=0;
 clrscr();
 printf("\nEnter Decimal Number: ");
 scanf("%d",&b);
 if(b>0)
 {
  a=b;
  printf("\nThe binary equivalant of decimal number is: 0");
 }
 else
 {
  a=-b;
  printf("\nThe binary equivalant of decimal number is: 1") ;
 }
 for(i=0;a!=0;++i)
 {
  c=a%2;
  no[i]=c;
  a=a/2;
  ++n;
 }

 for(i=n-1;i>=0;--i)
 {
  printf("%d",no[i]);
 }
 getch();
}