valarray exp() function in C++

The exp() function is defined in valarray header file. This function is used to calculate e raised to the power equal to the value of the element in valarray.

Syntax:

`exp(varr);`

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

Returns: This function returns a valarray containing the exponential values of all the elements.

Below programs illustrate the above function:

Example 1:-

 `// C++ program to demonstrate ` `// example of exp() function. ` ` `  `#include ` `using` `namespace` `std; ` ` `  `int` `main() ` `{ ` ` `  `    ``// Initializing valarray ` `    ``valarray<``double``> ` `        ``varr = { 1, 2, 3, 4, 5 }; ` ` `  `    ``// Declaring new valarray ` `    ``valarray<``double``> varr1; ` ` `  `    ``// use of exp() function ` `    ``varr1 = ``exp``(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 :
2.71828 7.38906 20.0855 54.5982 148.413
```

Example 2:-

 `// C++ program to demonstrate ` `// example of exp() function. ` ` `  `#include ` `using` `namespace` `std; ` ` `  `int` `main() ` `{ ` ` `  `    ``// Initializing valarray ` `    ``valarray<``double``> ` `        ``varr = { -1, 0, 3, 0, -5 }; ` ` `  `    ``// Declaring new valarray ` `    ``valarray<``double``> varr1; ` ` `  `    ``// use of exp() function ` `    ``varr1 = ``exp``(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 :
0.367879 1 20.0855 1 0.00673795
```

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