squareroot c++

/*program to find out square root of a number*/

#include <iostream>

using namespace std;
class root
{
    private:
            float square,squareroot,num,error;
    public:
            // this method takes the input from the user
            void getdata()
            {
                cout<<"\nENTER THE NUMBER WHOSE SQUARE IS TO BE FOUND :";
                cin>>square;
                again:
                    cout<<"ENTER THE INITIAL GUESS :";
                    cin>>squareroot;
                    squareroot = squareroot%square; //guess should be smaller than the entered number
                    error=0.000001;
            }

            void findroot()
            {
                do
                {
                    num=square/squareroot;      //calculating quotient
                    if(((num<squareroot)&&(squareroot-num<error)) || ((num>squareroot)&&(num-squareroot<error)) || (squareroot==num))
                    {
                        cout<<"\nTHE SQUARE ROOT OF "<<square<<" IS : "<<squareroot;
                        break;
                    }
                    else
                    {
                        squareroot=(squareroot+num)/2;
                    }
                }while(1);
            }
};

int main()
{
    root r1;
    int cont=0;
    do
    {
        r1.getdata();
        r1.findroot();
        cout<<"\nDO YOU WANT TO CHECK AGAIN (1/0):";
        cin>>cont;
    }while(cont==1);
    return 0;
}
/*****************************OUTPUT***************************************

ENTER THE NUMBER WHOSE SQUARE IS TO BE FOUND :81
ENTER THE INITIAL GUESS :7

THE SQUARE ROOT OF 81.000000 IS : 9.000000

DO YOU WANT TO ENTER ANOTHER NUMBER (1/0) : 1

ENTER THE NUMBER WHOSE SQUARE IS TO BE FOUND :65
ENTER THE INITIAL GUESS :4

THE SQUARE ROOT OF 65.000000 IS : 8.062258

DO YOU WANT TO ENTER ANOTHER NUMBER (1/0) : 1

ENTER THE NUMBER WHOSE SQUARE IS TO BE FOUND :56
ENTER THE INITIAL GUESS :2

THE SQUARE ROOT OF 56.000000 IS : 7.483315

DO YOU WANT TO ENTER ANOTHER NUMBER (1/0) : 0

Process returned 0 (0x0)
Press any key to continue.

*/