Table of Contents

5.6.9.3 Arithmetic Operators

Note

This section describes the implementation of MS-VBAL §5.6.9.3 Arithmetic Operators.

Runtime Semantics

Arithmetic operators are simple data operators (RD-VBAL §5.6.9.2 Simple Data Operators):

  • They validate their operands through OperatorRuntimeSemantics.LetCoerceNonNullOperand.
  • Their result is computed in the effective type's own representation, never through a Double intermediate: Long in a 32-bit int, Currency and Decimal in decimal, Single in float.

Arithmetic runs in a checked context. An integral or fixed-point result that does not fit the effective type raises Overflow rather than wrapping or silently narrowing.

Condition Run-time error
An integral or fixed-point result does not fit the effective type. 6 — Overflow

Run-time error 6 is VBRuntimeErrorId.Overflow. For division by zero, see RD-VBAL §5.6.9.3.6 \ Operator and Mod Operator.

5.6.9.3.1 Unary - Operator

This section corresponds to MS-VBAL §5.6.9.3.1 Unary - Operator.

Note

Reserved. This section has no content yet.

5.6.9.3.2 + Operator

Note

This section describes the implementation of MS-VBAL §5.6.9.3.2 + Operator.

🧩 RD-VBA explicitly adds runtime semantics for a unary + operator, as a language core extension (RD-VBAL §1.1.2 Language Core Extensions).

👉 A For loop's ForNext instruction adds step to the counter through the addition operator, RDCore.Runtime.Semantics.Operators.Arithmetic.BinaryAdditionOperatorRuntimeSemantics. The step addition is therefore an overflow-checked operation, not a plain CLR addition (RD-VBAL §5.4.2.3 For Statement).

5.6.9.3.3 Binary - Operator

This section corresponds to MS-VBAL §5.6.9.3.3 Binary - Operator.

Note

Reserved. This section has no content yet.

5.6.9.3.4 * Operator

This section corresponds to MS-VBAL §5.6.9.3.4 * Operator.

Note

Reserved. This section has no content yet.

5.6.9.3.5 / Operator

This section corresponds to MS-VBAL §5.6.9.3.5 / Operator.

Note

Reserved. This section has no content yet.

5.6.9.3.6 \ Operator and Mod Operator

Note

This section describes the implementation of MS-VBAL §5.6.9.3.6 \ Operator and Mod Operator.

Static Semantics

Note

Not implemented. The Mod operator token has no mapped static semantics rule. The static semantics of a Mod expression defer to VBUnknownType (RD-VBAL §5.0 Semantics).

Runtime Semantics

Condition Run-time error
An integral division or Mod by zero. 11 — Division by zero

Run-time error 11 is VBRuntimeErrorId.DivisionByZero.

5.6.9.3.7 ^ Operator

Note

This section describes the implementation of MS-VBAL §5.6.9.3.7 ^ Operator.

The ^ operator is the sole exception to computation in the effective type (RD-VBAL §5.6.9.2 Simple Data Operators): its effective type is always Double. The ^ operator is evaluated as IEEE-754 exponentiation.

⏮️ RD-VBAL §5.6.9.2 Simple Data Operators | ⏭️ RD-VBAL §5.6.9.4 & Operator

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