C++ Valarray::cos Function

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The C++ Valarray::cos() function calculates the cosine of each element's value in a valarray and returns a valarray that contains the cosines of all the elements. Each element receives a single call to this method, which overloads the cmaths cos() function.

Syntax

Following is the syntax for C++ Valarray::cos Function −

 cos (const valarray<T>& x); 

Parameters

x − It is containing elements of a type for which the unary function cos is defined.

Examples

Example 1

Let's look into the following example, where we are going to use cos() function and retrieving the output.

 #include <iostream> #include <valarray> using namespace std; int main() {	valarray<double>	varr = { 0.1, 0.2, 0.3, 0.4, 0.5 };	valarray<double> varr1;	varr1 = cos(varr); cout << "The New cos " << " Valarray is : "	<< endl;	for (double& x : varr1) {	cout << x << " ";	}	cout << endl;	return 0; } 

Output

Let us compile and run the above program, this will produce the following result −

 The New cos Valarray is : 0.995004 0.980067 0.955336 0.921061 0.877583 

Example 2

Let's consider the following example, where we are going to use cos() function and retrieving the output along with multiplication result value of the cos().

 #include <cmath> #include <iomanip> #include <iostream> #include <valarray> void show(const char* title, const std::valarray<float>& data) { const int w { 8}; std::cout << std::setw(w) << title << " | "; for (float a : data) std::cout << std::setw(w) << a << " | "; std::cout << '\n'; } int main() { const std::valarray<float> a { .1, .2, .3, .4 }; const auto cos = std::cos(a); const auto Multiply = (cos * cos); show("a", a); show("cos(a)", cos); show("Multiply(cos * cos)", Multiply ); } 

Output

Let us compile and run the above program, this will produce the following result −

 a | 0.1 | 0.2 | 0.3 | 0.4 | cos(a) | 0.995004 | 0.980067 | 0.955337 | 0.921061 | Multiply(cos * cos) | 0.990033 | 0.960531 | 0.912668 | 0.848353 | 

Example 3

In the following example, we are going to use cos() function and retrieving the output of both original valarray and cos() valarray.

 #include <iostream> #include <valarray> using namespace std; int main() { valarray<double> myvalarray = { 0.6, -0.5, -0.4, -1 }; cout << "The Orignal Valarray is : "; for (double& ele : myvalarray) cout << ele << " "; valarray<double> cosvalarray = cos(myvalarray); cout << "\nThe cos Valarray is: "; for (double& ele : cosvalarray) cout << ele << " "; return 0; } 

Output

Let us compile and run the above program, this will produce the following result −

 The Orignal Valarray is : 0.6 -0.5 -0.4 -1 The cos Valarray is: 0.825336 0.877583 0.921061 0.540302 

Example 4

Following is the another example, where we are going to use cos() with integral type and retrieving the output.

 #include <iostream> #include <cmath> using namespace std; int main() { int a = 142; double result; result = cos(a); cout << "cos(a) = " << result << endl; return 0; } 

Output

Let us compile and run the above program, this will produce the following result −

 cos(a) = -0.80901