C++ copysign()用法及代碼示例

copysign(x，y)函數返回值為x且值為y的值。

例子：

Input:copysign(6, -2)
Output:-6

Input:copysign(-6, 2)
Output:6

用法:

copysign(x, y);

參數：

x:Value with the magnitude 
y:Value with the sign 

返回值：

Returns the value with a magnitude of x
and the sign of y.
Return type follows type casting i.e., 
if If one element is float and second 
element int then it returns float. 

下麵是上述的實現：

// C++ program to return copysign value 
#include <bits/stdc++.h>      
using namespace std;      
  
int main () 
{ 
    cout << "Magnitude = 6 Sign = -2 " << endl; 
    cout << "Copysign(6, -2) = " 
         << copysign(6, -2) << endl; 
      
    cout << endl; 
      
    cout << "Magnitude = -6 Sign = 2 " << endl; 
    cout << "Copysign(-6, 2) = " 
         << copysign(-6, 2); 
      
    return 0; 
}

輸出：

Magnitude = 6  Sign = -2
Copysign(6, -2) = -6

Magnitude = -6  Sign = 2
Copysign(-6, 2) = 6