The cos() function is defined in valarray header file. This function is used to calculate cosine of the value of each element in valarray and returns a valarray containing the cosine of all the elements. Syntax:
cos(varr);
Time Complexity: O(1)
Auxiliary Space: O(1)
Parameter: This function takes a mandatory parameter varr which represents valarray. Returns: This function returns a valarray containing the cosine of all the elements. Below programs illustrate the above function: Example 1:-
CPP
// C++ program to demonstrate // example of cos() function. #include <bits/stdc++.h> using namespace std;
int main()
{ // Initializing valarray
valarray< double >
varr = { 0, 0.25, 0.5, 0.75, 1 };
// Declaring new valarray
valarray< double > varr1;
// use of cos() function
varr1 = cos (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 : 1 0.968912 0.877583 0.731689 0.540302
Example 2:-
CPP
// C++ program to demonstrate // example of cos() function. #include <bits/stdc++.h> using namespace std;
int main()
{ // Initializing valarray
valarray< double >
varr = { 1.2, 3.14, 5.0, 0.0 };
// Declaring new valarray
valarray< double > varr1;
// use of cos() function
varr1 = cos (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 : 0.362358 -0.999999 0.283662 1