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---
title: "Arithmetic Operations on Pointers (C# Programming Guide)"
title: "Arithmetic operations on pointers (C# Programming Guide)"
ms.date: 07/20/2015
helpviewer_keywords:
- "pointers [C#], arithmetic operations"
ms.assetid: d4f0b623-827e-45ce-8649-cfcebc8692aa
---
# Arithmetic Operations on Pointers (C# Programming Guide)
This topic discusses using the arithmetic operators `+` and **-** to manipulate pointers.
# Arithmetic operations on pointers (C# Programming Guide)
This topic discusses using the arithmetic operators `+` and `-` to manipulate pointers.

> [!NOTE]
> You cannot perform any arithmetic operations on void pointers.

## Adding and Subtracting Numeric Values to or From Pointers
You can add a value `n` of type [int](../../../csharp/language-reference/keywords/int.md), [uint](../../../csharp/language-reference/keywords/uint.md), [long](../../../csharp/language-reference/keywords/long.md), or [ulong](../../../csharp/language-reference/keywords/ulong.md) to a pointer, `p`,of any type except `void*`. The result `p+n` is the pointer resulting from adding `n * sizeof(p) to the address of p`. Similarly, `p-n` is the pointer resulting from subtracting `n * sizeof(p)` from the address of `p`.
## Adding and subtracting numeric values to or from pointers
You can add a value `n` of type [int](../../../csharp/language-reference/keywords/int.md), [uint](../../../csharp/language-reference/keywords/uint.md), [long](../../../csharp/language-reference/keywords/long.md), or [ulong](../../../csharp/language-reference/keywords/ulong.md) to a pointer. If `p` is a pointer of the type `pointer-type*`, the result `p+n` is the pointer resulting from adding `n * sizeof(pointer-type)` to the address of `p`. Similarly, `p-n` is the pointer resulting from subtracting `n * sizeof(pointer-type)` from the address of `p`.

## Subtracting Pointers
## Subtracting pointers
You can also subtract pointers of the same type. The result is always of the type `long`. For example, if `p1` and `p2` are pointers of the type `pointer-type*`, then the expression `p1-p2` results in:

`((long)p1 - (long)p2)/sizeof(pointer_type)`
`((long)p1 - (long)p2)/sizeof(pointer-type)`

No exceptions are generated when the arithmetic operation overflows the domain of the pointer, and the result depends on the implementation.

Expand All @@ -26,10 +26,10 @@ This topic discusses using the arithmetic operators `+` and **-** to manipulate

[!code-csharp[csProgGuidePointers#15](../../../csharp/programming-guide/unsafe-code-pointers/codesnippet/CSharp/arithmetic-operations-on-pointers_2.cs)]

## C# Language Specification
## C# language specification
[!INCLUDE[CSharplangspec](~/includes/csharplangspec-md.md)]

## See Also
## See also

- [C# Programming Guide](../../../csharp/programming-guide/index.md)
- [Unsafe Code and Pointers](../../../csharp/programming-guide/unsafe-code-pointers/index.md)
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