# Cpp - Write program to calculate the square roots of the numbers

## 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;
}
```