# Intro

# C# Arithmetic Operators

C# defines the following arithmetoc operators:

Arithmetic Operator | Meaning |
---|---|

+ | Addition |

- | Subtract |

* | Multiplication |

/ | Division |

% | Modulus |

++ | Increment |

-- | Decrement |

`+`

,`-`

,`*`

and `/`

all work as you would expect them to. They cab be used with any built-in numeric data type.

When the `/`

is applied to integers, any remainder gets truncated e.g `9/4`

results to `2`

.

To obtain the remainder of the division you use the *modulus operator*,`%`

. This operator can also be called *remainder operator*. e.g `9 % 4`

results to `1`

. The modulus operator can be used with both floating point and integer numbers.

EXAMPLE ```c# using System;

```
namespace ArithmeticApp
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Addition : 9 + 4 = {0}", 9 + 4);
Console.WriteLine("Substraction : 9 - 4 = {0}", 9 - 4);
Console.WriteLine("Multiplication : 9 * 4 = {0}", 9 * 4);
Console.WriteLine("Division : 9 / 4 = {0}", 9 / 4);
Console.WriteLine("Modulus : 9 % 4 = {0}", 9 % 4);
Console.Read();
}
}
}
```

`RESULT`

```
Addition : 9 + 4 = 13
Substraction : 9 - 4 = 5
Multiplication : 9 * 4 = 36
Division : 9 / 4 = 2
Modulus : 9 % 4 = 1
```

```
## [](#increment-and-decrement)Increment and Decrement
The `++` and the `--` are the _increment_ and _decrement_ operators respectively.
The increment operator adds `1` to its operand while the decrement operator subtracts `1` from its operand.
For instance:
`i = i + 1` is the same as `i++`.
And :
`i = i - 1` is the same as `i--`.
The increment and decrement operators can either _prefix_ or _postfix_ the operand.
```c#
i = i + 1
```

can be written as

PREFIX
```c#
++i;

```
or
POSTFIX
```c#
x++;
```

Clearly if we were to run the above example, there is no difference between the two forms of increment operators.

However, when these operators are used in part of a larger expression, there is a significant difference.

When these operators precede their operand, the result of the operation is the value of the operand after the increment/decrement.

If it follows their operand, the result of the operation is the value of the operand before the increment/decrement.

EXAMPLE ```c# using System;

```
namespace ArithmeticApp
{
class Program
{
static void Main(string[] args)
{
int a = 99,b =99,c = 99, d = 99;
Console.WriteLine("POST-INCREMENT = {0}", a++);
Console.WriteLine("PRE-INCREMENT = {0}", ++b);
Console.WriteLine("POST-DECREMENT = {0}", c--);
Console.WriteLine("PRE-DECREMENT = {0}", --d);
Console.Read();
}
}
}
```

`RESULT`

```
POST-INCREMENT = 99
PRE-INCREMENT = 100
POST-DECREMENT = 99
PRE-DECREMENT = 98
```

```
So here's the deal:
* `a++` : First the value of `a` is retrieved. Then it's incremented. However, the original value of `a` is what is returned. In this case `99`.
* `++b` : Fisrt the value of `b` is incremented. Then it's retrieved and returned. So in this case `1` is added to `99` then the result,`100` is returned.
* `c++` : First the value of `c` is retrieved. Then it's decremented. However, the original value of `c` is what is returned. In this case `99`.
* `d--` : Fisrt the value of `d` is decremented. Then it's retrieved and returned. So in this case `1` is subtracted from `99` then the result,`98` is returned.
```

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