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