copysign(x，y)函数返回值为x且值为y的值。
例子：
Input : copysign(6, -2)
Output : -6
Input : copysign(-6, 2)
Output : 6
句法：
copysign(x, y);
参数：
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.
下面是上述的实现：
// C++ program to return copysign value
#include
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;
}
输出：
Magnitude = 6 Sign = -2
Copysign(6, -2) = -6
Magnitude = -6 Sign = 2
Copysign(-6, 2) = 6
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