C# - Operators review (Logical, Arithmetic and Comparing )

Arithmetic Operations

The ‘+’ Operator:

class Program

    {

        static void Main(string[] args)

        {

            // Example 1:

            int a = 5;

            int b = 5;

            int c = a + b;

            //c = 10

            // Example 2:

            int d = 5 + 3;

     //d = 8

        }

    }

The ‘-’ Operator:

static void Main(string[] args)
        {
            // Example 1:
            int a = 5;
            int b = 5;
            int c = a - b;

            //c = 0

            // Example 2:

            int d = 5 - 3;

            //d = 2

        }

The ‘/’ Operator:

static void Main(string[] args)

        {

            // Example 1:

            int a = 25;

            int b = 5;
            int c = a / b;
            //c =

            // Example 2:

            int d = 100 / 10;

            //d = 10

        }

The ‘%’ Operator:

static void Main(string[] args)

        {

            // Example 1:

             int a = 25;
            int b = 5;
            int c = a % b;
            //c = 0

            // Example 2:

            int d = 100 % 9;          

            //d = 1

        }

Logical Operations

F = False

T = True

Variable name	A	B	A AND B (&&)	A OR B (||)
Case 1	F	F	F	F
Case 2	T	T	T	T
Case 3	F	T	F	T
Case 4	T	F	F	T

The ‘OR’ Operator:

if ((a > b) || (a < c) )

            {

                //Use the 'OR' operation between two relational conditions

            }

The ‘AND’ Operator:

if ((a > b) && (a < c))

            {

                //Use the 'AND' operation between 2 relational conditions

            }

The ‘True’ Operator:

if ((a > b) == true)

            {

                //Perform operation if the condition return ‘false’      

            }

The ‘False’ Operator:

  if ((a > b) == false )

            {

                //Perform operation if the condition return ‘false’   

            }

The ‘!’ Operator:

if (!(a > b))

            {

                //Perform operation if 'a' is not bigger then 'b'          

            }

Comparing Operations

Operator No'1 – Equal (==):

static void Main(string[] args)

        {

            int a = 1;

            int b = 2;      

            if (a == b)

            {

                //Perform operation if 'a' is Equal to 'b'                  

            }        

        }

Operator No'2 – Smaller (<):

class Program

    {

        static void Main(string[] args)

        {

            int a = 1;

            int b = 2;    

            if (a < b)

            {

                //Perform operation if 'a' is smaller then 'b'                  

            } 
        }
    }

 Operator No'3 – Bigger (>):

class Program
    {
        static void Main(string[] args)
        {

            int a = 1;

            int b = 2;

            if (a > b)

            {

                //Perform operation if 'a' is bigger then 'b'  

            }   

        }

    }

Operator No'4 – Bigger or Equal (>=):

static void Main(string[] args)

        {

            int a = 1;

            int b = 2; 

            if (a >= b)

            {

               //Perform operation if 'a' is Bigger Or Equal to 'b'                  
            }        
        }

Operator No'5 – Smaller or Equal (<=):

 static void Main(string[] args)

        {

            int a = 1;

            int b = 2;

            if (a <= b)

            {

                //Perform operation if 'a' is Smaller Or Equal to 'b'                  

            }        

        }

Operator No' 6 – Not Equal (! =):

static void Main(string[] args)

        {

            int a = 1

            int b = 2;       

            if (a != b)

            {

                //Perform operation if 'a' is not Equal to 'b'                  

            }        

        }

Shortcuts operations 

This article will cover the assignments operators you can use to perform mathematical operation.

Operator No'1 (+=):

This operator can be used when you want to add number to a variable

Full:     a = a + 5;

Shortcut: a += 5;           

Operator No'2 (-=):

This operator can be used when you want to reduce a number from a variable

Full:     a = a - 5;
Shortcut: a -= 5;

Operator No'3 (*=):

This operator can be used when you want to multiply a variable with another number

Full:     a = a * 5;

Shortcut: a *= 5;

Operator No'4 (/=):

This operator can be used when you want to divide variable with a number  

Full:     a = a / 5;

Shortcut: a /= 5;

Increment and Decrement operators

Additional operators that you can use is decrement (--) and increment (++) that may be used on a single variable.

Increment Example:

Using this operator will cause an aggregation of +1 for the manipulated variable
Y = y + 1;

Y++;

Decrement Example:
Using this operator will cause a degradation of -1 for the manipulated variable
Y = y - 1;

Y--;

Note!

If you set the operator from the left of the variable (--X or ++Y) the operation will take place before committing the operation.