How to calculate the square root (C++)

Squareroot

sqrroot() calculates the square root of the given value and it takes 1 parameter:

val takes the value whose square root is desired.

Code

#include "stdafx.h"

#include "iostream"

#include "conio.h"

#include "iomanip"

using namespace std;

double sqrroot(double val)

{

 double i=0;

 double temp1,temp2;

      

       while(i*i<=val)

              i=i+0.1;

       temp1=i;

   

       for(int j=0;j<15;j++)

       {

              temp2=val;

              temp2=temp2/temp1;

              temp2=temp2+temp1;

              temp2=temp2/2;

              temp1=temp2;

       }

return temp2;

}

int main()

{

       cout << sqrroot ( 2.0 ) << endl ;

       cout << sqrroot ( 3.0 ) << endl ;

       cout << sqrroot ( 5.0 ) << endl ;

       cout << sqrroot ( 9.0 ) << endl ;

       _getche();

       return 0;

}

Output

1.41421

1.73205

2.23607

3