Constructor Overloading C++ to convert an octal number into binary

Constructor Overloading C++ to convert an octal number into binary

Write a program in C++ to convert an octal number into binary using constructor overloading.

#include<iostream>
using namespace std;
class binary
{
	private:
	long int p=1;
	long int dec=0,i=1,j,d;
	long int binno=0;
	public:
		binary(int n)
		{
		for(j=n;j>0;j=j/10)
      	{
		d=j%10;
		if(i==1)
		{
			p=p*1;
		}
		else
		{
			p=p*8;
		}
		dec=dec+(d*p);
		i++;
	}
	i=1;
	for(j=dec;j>0;j=j/2)
	{
		binno=binno+(dec%2)*i;
		i=i*10;
		dec=dec/2;
	}
	cout<<"Octal number "<<n<<" equalant to Binary "<<binno;
		}
		binary(double x)
		{
		for(j=x;j>0;j=j/10)
    	{
		d=j%10;
		if(i==1)
		{
			p=p*1;
		}
		else
		{
			p=p*8;
		}
		dec=dec+(d*p);
		i++;
	}
	i=1;
	for(j=dec;j>0;j=j/2)
	{
		binno=binno+(dec%2)*i;
		i=i*10;
		dec=dec/2;
	}
	cout<<"Octal number "<<x<<" equalant to Binary "<<binno;
		}
};
int main()
{
	int select;
	cout<<"Enter option to Select(0-1): ";
	cin>>select;
	switch(select)
	{
		case 0:
		{
		int n;
		cout<<"Enter octal number to convert: ";
		cin>>n;
		binary b(n);
		break;
	    }
	    case 1:
	    	{
	    		double x;
	    		cout<<"Enter octal number to Convert: ";
	    		cin>>x;
	    		binary b(x);
	    		break;
			}
		default:
		cout<<"Invilide Choice:";
	}
 }

Output

Enter an octal number to convert: 4

Octal number 4 is equivalent to Binary: 100