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 <bits/stdc++.h> 
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 <bits/stdc++.h> 
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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