---
title: "NSDecimalMultiply(_:_:_:_:)"
framework: foundation
role: symbol
role_heading: Function
path: "foundation/nsdecimalmultiply(_:_:_:_:)"
---

# NSDecimalMultiply(_:_:_:_:)

Multiplies two decimal numbers together.

## Declaration

```swift
func NSDecimalMultiply(_ result: UnsafeMutablePointer<Decimal>, _ leftOperand: UnsafePointer<Decimal>, _ rightOperand: UnsafePointer<Decimal>, _ roundingMode: NSDecimalNumber.RoundingMode) -> NSDecimalNumber.CalculationError
```

## Discussion

Discussion Multiplies rightOperand by leftOperand and stores the product, possibly rounded off according to roundingMode, in result. For explanations of the possible return values and rounding modes, see NSDecimalAdd(_:_:_:_:). For more information, see Number and Value Programming Topics.

## See Also

### Performing arithmetic using references

- [NSDecimalCompact(_:)](foundation/nsdecimalcompact(_:).md)
- [NSDecimalAdd(_:_:_:_:)](foundation/nsdecimaladd(_:_:_:_:).md)
- [NSDecimalSubtract(_:_:_:_:)](foundation/nsdecimalsubtract(_:_:_:_:).md)
- [NSDecimalDivide(_:_:_:_:)](foundation/nsdecimaldivide(_:_:_:_:).md)
- [NSDecimalMultiplyByPowerOf10(_:_:_:_:)](foundation/nsdecimalmultiplybypowerof10(_:_:_:_:).md)
- [NSDecimalRound(_:_:_:_:)](foundation/nsdecimalround(_:_:_:_:).md)
- [NSDecimalPower(_:_:_:_:)](foundation/nsdecimalpower(_:_:_:_:).md)
- [NSDecimalNormalize(_:_:_:)](foundation/nsdecimalnormalize(_:_:_:).md)
- [Decimal.RoundingMode](foundation/decimal/roundingmode.md)
- [NSDecimalNumber.RoundingMode](foundation/nsdecimalnumber/roundingmode.md)
- [Decimal.CalculationError](foundation/decimal/calculationerror.md)
- [NSDecimalNumber.CalculationError](foundation/nsdecimalnumber/calculationerror.md)