C++ atanh()用法及代碼示例

atanh()是C++ STL中的內置函數，該函數返回以弧度給出的角度的反雙曲正切值。

用法:

atanh(data_type x)

參數：該函數接受一個強製性參數x，該參數指定弧度的反雙曲角在[-1，1]範圍內。該參數可以是double，float或long double數據類型。

返回值：此函數以弧度形式返回參數的反雙曲正弦值，具體取決於在參數中傳遞的參數。下表中給出了不同的返回值：

以下示例程序旨在說明上述方法：

示例1:

// C++ program to illustrate 
// the atanh() function 
// all return values 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Return value when -1<x<1 
    int x = 0; 
    // Function call to calculate atanh(x) value 
    double result = atanh(x); 
  
    cout << "atanh(0) = " << result << " radians\n"; 
    cout << "atanh(0) = " << result * 180 / 3.141592 
         << " degrees\n"; 
  
    // Return value when x=-1 
    x = -1; 
    result = atanh(x); 
  
    cout << "\natanh(-1) = " << result << " radians\n"; 
    cout << "atanh(-1) = " << result * 180 / 3.141592 
         << " degrees\n"; 
  
    // Return value when x=1 
    x = 1; 
    result = atanh(x); 
  
    cout << "\natanh(1) = " << result << " radians\n"; 
    cout << "atanh(1) = " << result * 180 / 3.141592 
         << " degrees\n"; 
  
    // Return value when x<-1 or x>1 
    x = -2; 
    result = atanh(x); 
  
    cout << "\natanh(-2) = " << result << " radians\n"; 
    cout << "atanh(-2) = " << result * 180 / 3.141592 
         << " degrees\n"; 
  
    return 0; 
}

輸出：

atanh(0) = 0 radians
atanh(0) = 0 degrees

atanh(-1) = -inf radians
atanh(-1) = -inf degrees

atanh(1) = inf radians
atanh(1) = inf degrees

atanh(-2) = -nan radians
atanh(-2) = -nan degrees

錯誤和異常：當傳遞字符串或任何其他data_type以外的函數時，該函數將返回不匹配的函數錯誤消息。

示例2:

// C++ program to demonstrate 
// the atanh() function  
// string passed 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    string x = "gfg"; 
  
    // Function call to calculate atanh(x) value 
    double result = atanh(x); 
  
    cout << "atanh(50.0) = " << result << " radians" << endl; 
    cout << "atanh(50.0) = " << result * 180 / 3.141592 
         << " degrees" << endl; 
    return 0; 
}

輸出：

prog.cpp:11:25: error: no matching function for call to 'atanh(std::__cxx11::string&)'
  double result = atanh(x);

相關用法

注：本文由純淨天空篩選整理自pawan_asipu大神的英文原創作品 atanh() function in C++ STL。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。