Subtracts two expressions
Syntax
Usage
result = lhs - rhs
Parameters
lhs
The left-hand side expression to subtract from.
rhs
The right-hand side expression to subtract.
T
Any pointer type.
Return Value
Returns the subtraction of two expressions.
Description
When the left and right-hand side expressions are numeric values,
Operator - (Subtract) returns the subtraction of the two values.
If the left and right-hand side expressions are both of the
T Pointer type, for some type
T, the operator performs pointer subtraction on the address, returning the result. This is different from numeric subtraction because the difference is divided by
SizeOf( T ).
If an integral value
n is subtracted from a
T Pointer type, the operator performs pointer arithmetic on the address, returning the memory position of a
T value,
n indices before (assuming
(-n) is within bounds of a contiguous array of
T values). This behaves differently from numeric subtraction, because the
Integer value is scaled by
SizeOf( T ).
Neither operand is modified in any way.
This operator can be overloaded to accept user-defined types.
Example
Dim n As Single
n = 4 - 5
Print n
will produce the output:
-1
Dialect Differences
- In the -lang qb dialect, this operator cannot be overloaded.
Differences from QB
See also