# Do sqrt for all elements in a valarray : valarray « valarray « C++ Tutorial

```#include <iostream>
#include <valarray>
#include <cmath>
using namespace std;

int main()
{
valarray<int> v(10);

for(int i=0; i<10; i++)
v[i] = i*i;

cout << "Original contents: ";
for(int i=0; i<10; i++)
cout << v[i] << " \n\n";

v = sqrt(v);

for(int i=0; i<10; i++)
cout << v[i] << " \n\n";

cout << endl;
}
```
```Original contents: 0

1

4

9

16

25

36

49

64

81

0

1

2

3

4

5

6

7

8

9```
 20.1.valarray 20.1.1. Create valarray of bool value by using comparison operator on another valarray 20.1.2. subtracting 10 from each element 20.1.3. Minus 10 from each element in a valarray 20.1.4. Plus two valarrays together 20.1.5. Get square root of elements in a valarray 20.1.6. Use valarray + valarray to double the value for each element in valarray 20.1.7. Do sqrt for all elements in a valarray 20.1.8. Print three-dimensional valarray line-by-line 20.1.9. Print valarray as two-dimensional array 20.1.10. valarray with double value inside