The function is defined in <cmath> header file.
[Mathematics] tanh x = tanh(x) [In C++ Programming]
tanh() prototype [As of C++ 11 standard]
double tanh(double x); float tanh(float x); long double tanh(long double x); double tanh(T x); // For integral type
The tanh() function takes a single argument in radians and returns the hyperbolic tangent of that angle in type double, float or long double type.
The hyperbolic tangent of x is given by,
tanh() Parameters
The tanh() function takes a single mandatory argument representing a hyperbolic angle in radian.
tanh() Return value
The tanh() function returns the hyperbolic tangent of the argument.
Example 1: How tanh() function works in C++?
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
double x = 0.50, result;
result = tanh(x);
cout << "tanh(x) = " << result << endl;
// x in Degrees
double xDegrees = 90;
x = xDegrees * 3.14159/180;
result = tanh(x);
cout << "tanh(x) = " << result << endl;
return 0;
}
When you run the program, the output will be:
tanh(x) = 0.462117 tanh(x) = 0.917152
Example 2: tanh() function with integral type
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int x = 5;
double result;
result = tanh(x);
cout << "tanh(x) = " << result << endl;
return 0;
}
When you run the program, the output will be:
tanh(x) = 0.999909
