NullableTypes Class Library | |

# NullableDouble Subtraction Operator

Computes the subtraction of the two specified NullableDouble
structures.

[Visual Basic]

returnValue = NullableDouble.op_Subtraction(x, y)

#### Parameters

*x*- A NullableDouble structure.
*y*- A NullableDouble structure.

#### Return Value

Null if either instance of NullableDouble is
Null otherwise a NullableDouble structure
whose Value property contains the results of the
subtraction.

#### Remarks

If the result of the operation is too small for a
NullableDouble, it becomes positive zero or negative zero.

If the result of the operation is too large for a
NullableDouble, it becomes
PositiveInfinity or
NegativeInfinity.

If the operation is invalid, the result of the operation becomes
NaN.

If one or both operands of the operation is
NaN, the result of the operation becomes
NaN.

#### See Also

NullableDouble Class | NullableTypes Namespace