## Requirements

Create a program to calculate the square roots of the numbers

4 12.25 0.0121

and output them.

Then read a number from the keyboard and output the square root of this number.

## Hint

To calculate the square root, use the function sqrt(), which is defined by the following prototype in the math.h (or cmath ) header file:

double sqrt( double x);

The return value of the sqrt() function is the square root of x.

## Demo

#include <iostream>
#include <cmath>
using namespace std;
int main() // w w w. j a v a2 s . c o m
{
double x1 = 4.0, x2 = 12.25, x3 = 0.0121;
cout << "\n Number \t Square Root" << endl;
cout << "\n " << x1 << " \t " << sqrt(x1)
<< "\n " << x2 << " \t " << sqrt(x2)
<< "\n " << x3 << " \t " << sqrt(x3) << endl;
cout << "\nType a number whose square root is to be"
" computed. ";
cin >> x1;
cout << "\n Number \t Square Root" << endl;
cout << "\n " << x1 << " \t " << sqrt(x1) << endl;
return 0;
}

## Result