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tanh() function in C++ STL

  • Last Updated : 25 Jun, 2018

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

Syntax :

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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 <bits/stdc++.h>
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 <bits/stdc++.h>
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 <bits/stdc++.h>
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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