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Numeric String and Data

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Built-in Value Types

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Declare and Initialize Variables

A variable stores a value that can change as theprogram executes

Declare and initialize a variable in one statement or

assign a value immediately after you declare it Use camel notation as programming convention

Example: type variableName;

variableName=value;

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Declare and Initialize Constants

A constant stores a value that cant be changed as theprogram executes

Example:

const type ConstantName=value;

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Naming Conventions

Start the names of variables with a lowercase letter ,and capitalize the first letter of each word after first

word, also called Camel Notation

Capitalize the first letter of each word of a constantname, also called Pascal Notation

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Arithmetic Expressions

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Arithmetic Expression

An arithmetic expression consists of one or moreoperands and arithmetic operators

The first five binary operators above are called

binary operators because they operate on twooperands . The next four are called unary operatorsbecause they operate because they operate on justone operand

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Assignment Operators

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Order of Precedence

1. Increment and decrement

2. Positive and negative

3. Multiplication, division , and modulus

4. Addition and subtraction

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Math Class

Round method:

Math.Round (decimalNumber[,precision])

Pow method

Math.Pow(number, power) Sqrt method Math.Sqrt(number)

Min and Max methods Math.{Min/Max}(number1,number2)

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Strings

A string can consist of any character includingsymbols

String literal-value of string in closed quotes

Null value-value of string is unknown Empty string-string with no value inside closed

quotes

Concatenation-join strings, uses the + sign

Append-adding one string to another, += string isused

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Escape sequences

\n new line

\t tab

\r carriage return

\\ - backlash \ - quotation

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.NET structures and data types

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.NET structures and data types

Each built in data type is supported by a structure ora class within the .NET framework. When you use aC# keyword to refer to a data type , youre actuallyusing an alias associated structure or class

A structure define a value type which stores its owndata

A class defines a reference type. A referenced typedoesnt store and data itself. Instead, it stores a

reference to the area of memory where data is stored All structures and classes shown are in the System

namespace

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Common methods for data conversion

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Some of the static methods of the convert class

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Standard numeric formatting codes

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How to use the ToString method to format a number

H h F h d f h S i l

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How to use the Format method of the String classto format a number