text: #include<iostream>
  #include<math.h>
  using namespace std;
  int main()
  {
      int a,s;
  	cout<<"enter a decimal no";
  	int b;
  	cin>>b;
  	int c,d,e[100],count=0,i=0;
  	while(b!=1)
  	{
   			c=b%2;
  			b=b/2;
  			e[i]=c;
  			count++;
  			i++;	
      }
      e[i]=1;
      
  	int j;
  	for(j=count;j>=0;j--)
  	{
  		cout<<e[j];
  		  }  
  		
  
  }
  