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C++ Valarray::tan() Function
The C++ Valarray::tan() function calculates the tangent of each element's value in a valarray and returns a valarray that contains the tangents of all the elements.
Tangent is a trigonometric function that mathematically describes the angle of a right-angled triangle. It is the ratio of length of the opposite side to the angle and side that is adjacent to the angle. For each element, this function makes a single call to the cmath's tan() function.
Syntax
Following is the syntax for C++ Valarray::tan() Function −
tan(const valarray<Type>& x);
Parameters
x − It contains elements of a type for which the unary function tan is defined.
Examples
Example 1
Let's consider the following example, where we are going to use tan() function and retrieving output.
#include <iostream> #include <valarray> using namespace std; int main() { valarray<double> valarray0 = {1,1.2,3,0.6,4}; valarray<double> valarray1; valarray1 = tan(valarray0); cout << "The New tan" << " Valarray is : " << endl; for (double& x : valarray1) { cout << x << " "; } cout << endl; return 0; }
Output
When we compile and run the above program, this will produce the following result −
The New tan Valarray is : 1.55741 2.57215 -0.142547 0.684137 1.15782
Example 2
Consider the following example, where we are going to use tan() function and getting output of both original valarray and tan valarray.
#include <iostream> #include <valarray> using namespace std; int main() { valarray<double> myvalarray = { 0.3,1.2,2.5,0.6}; cout << "The Original Valarray is : "; for (double& ele : myvalarray) cout << ele << " "; valarray<double> tanValarray; tanValarray = tan(myvalarray); cout << "\nThe tan Valarray is : "; for (double& ele : tanValarray) cout << ele << " "; return 0; }
Output
Let us compile and run the above program, this will produce the following result −
The Original Valarray is : 0.3 1.2 2.5 0.6 The tan Valarray is : 0.309336 2.57215 -0.747022 0.684137
Example 3
In the following example, we are going to use the integral type with the tan() function and retrieving the output.
#include <iostream> #include <valarray> using namespace std; int main() { long int a = 4; double result; result = tan(a); cout << "tan(a) = " << result; return 0; }
Output
On running the above program, it will produce the following result −
tan(a) = 1.15782
Example 4
Following is the example where we are going to pass degree= '90' to the tan() function and check how it works and retrieve the output.
#include <iostream> #include <valarray> using namespace std; int main() { double a = 3.6, result; result = tan(a); cout << "tan(a) = " << result << endl; double xDegree = 90; result = tan(xDegree*3.14159/180); cout << "tan(a) with degree 90 = " << result << endl; return 0; }
Output
When we compile and run the above program, this will produce the following result −
tan(a) = 0.493467 tan(a) with degree 90 = 753696
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