# IT. Expert System.

## C#

### Arithmatic Operators

Following table shows all the arithmetic operators supported by C#. Assume variable A holds 10 and variable B holds 20, then:

OperatorDescriptionExample
+Adds two operands A + B will give 30
-Subtracts second operand from the first A - B will give -10
*Multiplies both operands A * B will give 200
/Divides numerator by de-numerator B / A will give 2
%Modulus Operator and remainder of after an integer division B % A will give 0
++Increment operator increases integer value by one A++ will give 11
--Decrement operator decreases integer value by one A-- will give 9

## Example

Try the following example to understand all the arithmetic operators available in C#:

```using System;

namespace OperatorsAppl
{
class Program
{
static void Main(string[] args)
{
int a = 21;
int b = 10;
int c;

c = a + b;
Console.WriteLine("Line 1 - Value of c is {0}", c);
c = a - b;
Console.WriteLine("Line 2 - Value of c is {0}", c);
c = a * b;
Console.WriteLine("Line 3 - Value of c is {0}", c);
c = a / b;
Console.WriteLine("Line 4 - Value of c is {0}", c);
c = a % b;
Console.WriteLine("Line 5 - Value of c is {0}", c);
c = a++;
Console.WriteLine("Line 6 - Value of c is {0}", c);
c = a--;
Console.WriteLine("Line 7 - Value of c is {0}", c);
}
}
}
```

When the above code is compiled and executed, it produces the following result:

```Line 1 - Value of c is 31
Line 2 - Value of c is 11
Line 3 - Value of c is 210
Line 4 - Value of c is 2
Line 5 - Value of c is 1
Line 6 - Value of c is 21
Line 7 - Value of c is 22
```

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