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; } |
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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; } |
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Output:
The new valarray with manipulated values is : 0.367879 1 20.0855 1 0.00673795
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