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tanh() function in C++ STL
The tanh() function returns the hyperbolic tangent of an angle given in radians. It is an inbuilt function in C++ STL.
The syntax of the tanh() function is given as follows.
tanh(var)
As can be seen from the syntax, the function tanh() accepts a parameter var of data type float, double or long double. It returns the hyperbolic tangent of var.
A program that demonstrates tanh() in C++ is given as follows.
Example
#include <iostream>
#include <cmath>
using namespace std;
int main() {
double d = 5, ans;
ans = tanh(d);
cout << "tanh("<< d <<") = " << ans << endl;
return 0;
}output
tanh(5) = 0.999909
In the above program, first the variable d is initialized. Then hyperbolic tangent of d is found using tanh() and stored in ans. Finally the value of ans is displayed. This is demonstrated by the following code snippet.
double d = 5, ans;
ans = tanh(d);
cout << "tanh("<< d <<") = " << ans << endl;If the value is provided in degrees, it is converted to radians before using tanh() function.as it returns the hyperbolic tangent of an angle given in radians A program to demonstrate this is as follows −
Example
#include <iostream>
#include <cmath>
using namespace std;
int main() {
double degree = 60, ans;
degree = degree * 3.14159/180;
ans = tanh(degree);
cout << "tanh("<<degree<<") = " << ans <<endl;
return 0;
}Output
tanh(1.0472) = 0.780714
In the above program, the value is given in degree. So it is converted into radians and then the hyperbolic tangent is obtained using tanh(). Finally, the output is displayed. This is demonstrated by the following code snippet.
double degree = 60, ans;
degree = degree * 3.14159/180;
ans = tanh(degree);
cout << "tanh("<<degree<<") = " << ans <<endl;
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