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valarray sqrt() function in C++
• Last Updated : 24 Oct, 2018

The sqrt() function is defined in valarray header file. This function is used to calculate square root of the value of each element in valarray.

Syntax:

```sqrt(varr);
```

Parameter: This function takes a mandatory parameter varr which represents valarray.

Returns: This function returns a valarray containing the square root of all the elements of valarray.

Below programs illustrate the above function:

Example 1:-

 `// C++ program to demonstrate``// example of sqrt() function.`` ` `#include ``using` `namespace` `std;``int` `main()``{``    ``// Initializing valarray``    ``valarray<``double``>``        ``varr = { 4, 16, 25, 36, 49 };`` ` `    ``// Declaring new valarray``    ``valarray<``double``> varr1;`` ` `    ``// use of sqrt() function``    ``varr1 = ``sqrt``(varr);`` ` `    ``// Displaying new elements value``    ``cout << ``"The new valarray with"``         ``<< ``" manipulated values is : "``         ``<< endl;`` ` `    ``for` `(``double``& x : varr1) {``        ``cout << x << ``" "``;``    ``}`` ` `    ``cout << endl;`` ` `    ``return` `0;``}`
Output:
```The new valarray with manipulated values is :
2 4 5 6 7
```

Example 2:-

 `// C++ program to demonstrate``// example of sqrt() function.`` ` `#include ``using` `namespace` `std;``int` `main()``{``    ``// Initializing valarray``    ``valarray<``double``>``        ``varr = { 5, 16, 26, 37, 1 };`` ` `    ``// Declaring new valarray``    ``valarray<``double``> varr1;`` ` `    ``// use of sqrt() function``    ``varr1 = ``sqrt``(varr);`` ` `    ``// Displaying new elements value``    ``cout << ``"The new valarray with"``         ``<< ``" manipulated values is : "``         ``<< endl;`` ` `    ``for` `(``double``& x : varr1) {``        ``cout << x << ``" "``;``    ``}`` ` `    ``cout << endl;`` ` `    ``return` `0;``}`
Output:
```The new valarray with manipulated values is :
2.23607 4 5.09902 6.08276 1
```
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