# tanh() function in C++ STL

The tanh() is an inbuilt function in C++ STL which returns the hyperbolic tangent of an angle given in radians.

Syntax :

tanh(data_type x)

Parameter :The function accepts one mandatory parameter x which specifies the hyperbolic angle in radian. The parameter can be of double, float or long double datatype.

Return Value:The function returns the hyperbolic tangent of the argument.

Below programs illustrate the above method:

Program 1:

 // CPP program to demonstrate the // tanh() function #include using namespace std;    int main() {     double x = 4.1, result;        result = tanh(x);     cout << "tanh(4.1) = " << result << endl;        // x in Degrees     double xDegrees = 90;     x = xDegrees * 3.14159 / 180;        result = tanh(x);     cout << "tanh(90 degrees) = " << result << endl;        return 0; }

Output:

tanh(4.1) = 0.999451
tanh(90 degrees) = 0.917152

Program 2:

 // CPP program to demonstrate the // tanh() function #include using namespace std;    int main() {     int x = -4;     double result;        result = tanh(x);     cout << "tanh(-4) = " << result << endl;        // x in Degrees     double xDegrees = 90;     x = xDegrees * 3.14159 / 180;        result = tanh(x);     cout << "tanh(90 degrees) = " << result << endl;        return 0; }

Output:

tanh(-4) = -0.999329
tanh(90 degrees) = 0.761594

Errors and Exceptions: The function returns no matching function for call to error when a string or character is passed as an argument.

Program 3:

 // CPP program to demonstrate the tanh() // function when a string is passed as argument  #include using namespace std;    int main() {     string x = "gfg";     double result;        result = tanh(x);     cout << "tanh(x) = " << result << endl;        return 0; }

Output:

prog.cpp:14:20: error: no matching function for call to 'tanh(std::__cxx11::string&)'
result = tanh(x);

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