What We Do

- Our Focus is You

We focus on your online needs so that you can focus on your customer's needs. There are numerous way in which we can help you. We begin by reviewing your business goals, your marketing objectives, and your competitive position, and then we develop your online presence to meet your needs. - Dynamic Content

Today's web applications require dynamically driven content, and much of that content is provided by a database and a programming language operating in harmony to produce the desired results. MySQL and PHP are two of the most popular web development tools utilized to produce dynamic web sites. We can help you take control and begin building truly dynamic web content which is easier to maintain, is more responsive to your users, and can alter its appearance based upon differing situations. Contact Us today to discuss your custom development needs. - Content Management Systems (CMS)

We can deploy CMS applications to allow organizations to edit content easily, which significantly cuts down on costly professional maintenance fees. Our CMS expertise covers Joomla, Wordpress and Blogger platforms. We are ready to help you choose which works best for your specific needs. Contact Us today to begin taking control of your content.

Powered by Blogger.

## C# Operators

An operator is a symbol that tells the compiler to perform specific mathematical or logical manipulations. C# is rich in built-in operators and provides the following type of operators:

This tutorial will explain the arithmetic, relational, logical, bitwise, assignment and other operators one by one.

Example:

Example:

Example:

Assume if A = 60; and B = 13; now in binary format they will be as follows:

A = 0011 1100

B = 0000 1101

-----------------

A&B = 0000 1100

A|B = 0011 1101

A^B = 0011 0001

~A = 1100 0011

The Bitwise operators supported by C# are listed in the following table. Assume variable A holds 60 and variable B holds 13 then:

Example:

Example:

For example x = 7 + 3 * 2; here, x is assigned 13, not 20 because operator * has higher precedence than +, so it first gets multiplied with 3*2 and then adds into 7.

Here, operators with the highest precedence appear at the top of the table, those with the lowest appear at the bottom. Within an expression, higher precedence operators will be evaluated first.

Example:

- Arithmetic Operators
- Relational Operators
- Logical Operators
- Bitwise Operators
- Assignment Operators
- Misc Operators

This tutorial will explain the arithmetic, relational, logical, bitwise, assignment and other operators one by one.

### Arithmetic Operators

Following table shows all the arithmetic operators supported by C#. Assume variable A holds 10 and variable B holds 20 then:Operator | Description | Example |
---|---|---|

+ | 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 |

using System; namespace OperatorsAppl { class Program { static void Main(string[] args) { int a = 52; int b = 20; 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); Console.ReadLine(); } } }The above code will result in the following:

Line 1 - Value of c is 72 Line 2 - Value of c is 32 Line 3 - Value of c is 1040 Line 4 - Value of c is 5 Line 5 - Value of c is 6 Line 6 - Value of c is 53 Line 7 - Value of c is 51

### Relational Operators

Following table shows all the relational operators supported by C#. Assume variable A holds 10 and variable B holds 20, then:Operator | Description | Example |
---|---|---|

== | Checks if the values of two operands are equal or not, if yes then condition becomes true. | (A == B) is not true. |

!= | Checks if the values of two operands are equal or not, if values are not equal then condition becomes true. | (A != B) is true. |

> | Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true. | (A > B) is not true. |

< | Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true. | (A < B) is true. |

>= | Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true. | (A >= B) is not true. |

<= | Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true. | (A <= B) is true. |

using System; class Program { static void Main(string[] args) { int a = 52; int b = 20; if (a == b) { Console.WriteLine("Line 1 - a is equal to b"); } else { Console.WriteLine("Line 1 - a is not equal to b"); } if (a < b) { Console.WriteLine("Line 2 - a is less than b"); } else { Console.WriteLine("Line 2 - a is not less than b"); } if (a > b) { Console.WriteLine("Line 3 - a is greater than b"); } else { Console.WriteLine("Line 3 - a is not greater than b"); } /* Lets change value of a and b */ a = 5; b = 28; if (a <= b) { Console.WriteLine("Line 4 - a is either less than or equal to b"); } if (b >= a) { Console.WriteLine("Line 5-b is either greater than or equal to b"); } } }The above code will result in the following:

Line 1 - a is not equal to b Line 2 - a is not less than b Line 3 - a is greater than b Line 4 - a is either less than or equal to b Line 5 - b is either greater than or equal to b

### Logical Operators

Following table shows all the logical operators supported by C#. Assume variable A holds Boolean value true and variable B holds Boolean value false, then:Operator | Description | Example |
---|---|---|

&& | Called Logical AND operator. If both the operands are non zero then condition becomes true. | (A && B) is false. |

|| | Called Logical OR Operator. If any of the two operands is non zero then condition becomes true. | (A || B) is true. |

! | Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false. | !(A && B) is true. |

using System; namespace OperatorsAppl { class Program { static void Main(string[] args) { bool a = true; bool b = true; if (a && b) { Console.WriteLine("Line 1 - Condition is true"); } if (a || b) { Console.WriteLine("Line 2 - Condition is true"); } /* lets change the value of a and b */ a = false; b = true; if (a && b) { Console.WriteLine("Line 3 - Condition is true"); } else { Console.WriteLine("Line 3 - Condition is not true"); } if (!(a && b)) { Console.WriteLine("Line 4 - Condition is true"); } Console.ReadLine(); } } }The above code will result in the following:

Line 1 - Condition is true Line 2 - Condition is true Line 3 - Condition is not true Line 4 - Condition is true

### Bitwise Operators

Bitwise operator works on bits and perform bit by bit operation. The truth tables for &, |, and ^ are as follows:p | q | p & q | p | q | p ^ q |
---|---|---|---|---|

0 | 0 | 0 | 0 | 0 |

0 | 1 | 0 | 1 | 1 |

1 | 1 | 1 | 1 | 0 |

1 | 0 | 0 | 1 | 1 |

A = 0011 1100

B = 0000 1101

-----------------

A&B = 0000 1100

A|B = 0011 1101

A^B = 0011 0001

~A = 1100 0011

The Bitwise operators supported by C# are listed in the following table. Assume variable A holds 60 and variable B holds 13 then:

Operator | Description | Example |
---|---|---|

& | Binary AND Operator copies a bit to the result if it exists in both operands. | (A & B) will give 12. which is 0000 1100 |

| | Binary OR Operator copies a bit if it exists in either operand. | (A | B) will give 61, which is 0011 1101 |

^ | Binary XOR Operator copies the bit if it is set in one operand but not both. | (A ^ B) will give 49, which is 0011 0001 |

~ | Binary Ones Complement Operator is unary and has the effect of 'flipping' bits. | (~A ) will give -61, which is 1100 0011 in 2's complement due to a signed binary number. |

<< | Binary Left Shift Operator. The left operands value is moved left by the number of bits specified by the right operand. | A << 2 will give 240, which is 1111 0000 |

>> | Binary Right Shift Operator. The left operands value is moved right by the number of bits specified by the right operand. | A >> 2 will give 15, which is 0000 1111 |

### Assignment Operators

There are following assignment operators supported by C#:Operator | Description | Example |
---|---|---|

= | Simple assignment operator, Assigns values from right side operands to left side operand | C = A + B will assign value of A + B into C |

+= | Add AND assignment operator, It adds right operand to the left operand and assign the result to left operand | C += A is equivalent to C = C + A |

-= | Subtract AND assignment operator, It subtracts right operand from the left operand and assign the result to left operand | C -= A is equivalent to C = C - A |

*= | Multiply AND assignment operator, It multiplies right operand with the left operand and assign the result to left operand | C *= A is equivalent to C = C * A |

/= | Divide AND assignment operator, It divides left operand with the right operand and assign the result to left operand | C /= A is equivalent to C = C / A |

%= | Modulus AND assignment operator, It takes modulus using two operands and assign the result to left operand | C %= A is equivalent to C = C % A |

<<= | Left shift AND assignment operator | C <<= 2 is same as C = C << 2 |

>>= | Right shift AND assignment operator | C >>= 2 is same as C = C >> 2 |

&= | Bitwise AND assignment operator | C &= 2 is same as C = C & 2 |

^= | bitwise exclusive OR and assignment operator | C ^= 2 is same as C = C ^ 2 |

|= | bitwise inclusive OR and assignment operator | C |= 2 is same as C = C | 2 |

using System; namespace OperatorsAppl { class Program { static void Main(string[] args) { int a = 23; int c; c = a; Console.WriteLine("Line 1 - = Value of c = {0}", c); c += a; Console.WriteLine("Line 2 - += Value of c = {0}", c); c -= a; Console.WriteLine("Line 3 - -= Value of c = {0}", c); c *= a; Console.WriteLine("Line 4 - *= Value of c = {0}", c); c /= a; Console.WriteLine("Line 5 - /= Value of c = {0}", c); Console.ReadLine(); } } }The above code will result in the following:

Line 1 - = Value of c = 23 Line 2 - += Value of c = 46 Line 3 - -= Value of c = 23 Line 4 - *= Value of c = 529 Line 5 - /= Value of c = 23

### Misc Operators

There are few other important operators including sizeof, typeof and ? : supported by C#.Operator | Description | Example |
---|---|---|

sizeof() | Returns the size of a data type. | sizeof(int), will return 4. |

typeof() | Returns the type of a class. | typeof(StreamReader); |

& | Returns the address of an variable. | &a; will give actual address of the variable. |

* | Pointer to a variable. | *a; will pointer to a variable. |

? : | Conditional Expression | If Condition is true ? Then value X : Otherwise value Y |

is | Determines whether an object is of a certain type. | If( Ford is Car) // checks if Ford is an object of the Car class. |

as | Cast without raising an exception if the cast fails. | Object obj = new StringReader("Hello"); StringReader r = obj as StringReader; |

Example:

using System; namespace OperatorsAppl { class Program { static void Main(string[] args) { /* example of sizeof operator */ Console.WriteLine("The size of int is {0}", sizeof(int)); Console.WriteLine("The size of short is {0}", sizeof(short)); Console.WriteLine("The size of double is {0}", sizeof(double)); /* example of ternary operator */ int a, b; a = 10; b = (a == 1) ? 20 : 30; Console.WriteLine("Value of b is {0}", b); b = (a == 10) ? 20 : 30; Console.WriteLine("Value of b is {0}", b); Console.ReadLine(); } } }The above code will result in the following:

The size of int is 4 The size of short is 2 The size of double is 8 Value of b is 30 Value of b is 20

### Operators Precedence in C#

Operator precedence determines the grouping of terms in an expression. This affects how an expression is evaluated. Certain operators have higher precedence than others; for example, the multiplication operator has higher precedence than the addition operator:For example x = 7 + 3 * 2; here, x is assigned 13, not 20 because operator * has higher precedence than +, so it first gets multiplied with 3*2 and then adds into 7.

Here, operators with the highest precedence appear at the top of the table, those with the lowest appear at the bottom. Within an expression, higher precedence operators will be evaluated first.

Category | Operator | Associativity |
---|---|---|

Postfix | () [] -> . ++ - - | Left to right |

Unary | + - ! ~ ++ - - (type)* & sizeof | Right to left |

Multiplicative | * / % | Left to right |

Additive | + - | Left to right |

Shift | << >> | Left to right |

Relational | < <= > >= | Left to right |

Equality | == != | Left to right |

Bitwise AND | & | Left to right |

Bitwise XOR | ^ | Left to right |

Bitwise OR | | | Left to right |

Logical AND | && | Left to right |

Logical OR | || | Left to right |

Conditional | ?: | Right to left |

Assignment | = += -= *= /= %=>>= <<= &= ^= |= | Right to left |

Comma | , | Left to right |

Example:

using System; namespace OperatorsAppl { class Program { static void Main(string[] args) { int a = 20; int b = 10; int c = 15; int d = 5; int e; e = (a + b) * c / d; // ( 30 * 15 ) / 5 Console.WriteLine("Value of (a + b) * c / d is : {0}", e); e = ((a + b) * c) / d; // (30 * 15 ) / 5 Console.WriteLine("Value of ((a + b) * c) / d is : {0}", e); e = (a + b) * (c / d); // (30) * (15/5) Console.WriteLine("Value of (a + b) * (c / d) is : {0}", e); e = a + (b * c) / d; // 20 + (150/5) Console.WriteLine("Value of a + (b * c) / d is : {0}", e); Console.ReadLine(); } } }The above code will result in the following:

Value of (a + b) * c / d is : 90 Value of ((a + b) * c) / d is : 90 Value of (a + b) * (c / d) is : 90 Value of a + (b * c) / d is : 50

Subscribe to:
Posts
(Atom)