math.copysign Method (Single, Single)

mathcopysign Method (Single, Single)

Copies the sign of number2 to number1.

Namespace: C
Assembly: C.math (in C.math.dll) Version: 1.0.0.0 (1.0.0.0)

Syntax

public static float copysign(
	float number1,
	float number2
)

Public Shared Function copysign ( 
	number1 As Single,
	number2 As Single
) As Single

public:
static float copysign(
	float number1, 
	float number2
)

static member copysign : 
        number1 : float32 * 
        number2 : float32 -> float32

Parameters

number1: Type: SystemSingle
A floating-point number.
number2: Type: SystemSingle
A floating-point number.

Return Value

Type: Single
The floating-point number whose absolute value is that of number1 with the sign of number2.

Remarks

copysign(Single, Single) is the only portable way to manipulate the sign of a NaN value (to examine the sign of a NaN, signbit(Single) may also be used).

See copysign in the C standard documentation.

Examples

C++

Copy

Assert.IsTrue(math.copysign(0F, -0F) == -0F);
Assert.IsTrue(math.copysign(0F, -4F) == -0F);
Assert.IsTrue(math.copysign(2F, -0F) == -2F);
Assert.IsTrue(math.copysign(-2F, 0F) == 2F);
Assert.IsTrue(math.copysign(System.Single.PositiveInfinity, -2F) == System.Single.NegativeInfinity);
Assert.IsTrue(math.copysign(2F, System.Single.NegativeInfinity) == -2F);

Assert.IsTrue(math.copysign(0F, -0F) = -0F);
Assert.IsTrue(math.copysign(0F, -4F) = -0F);
Assert.IsTrue(math.copysign(2F, -0F) = -2F);
Assert.IsTrue(math.copysign(-2F, 0F) = 2F);
Assert.IsTrue(math.copysign(System.Single.PositiveInfinity, -2F) = System.Single.NegativeInfinity);
Assert.IsTrue(math.copysign(2F, System.Single.NegativeInfinity) = -2F);

Reference

math Class

copysign Overload

C Namespace