Complete set: Intro to C - Bill Buchanan

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2.5 Converting between types A cast does not involve processing ‐ data is simply interpreted in a different way. For example if we cast the character ʹ5ʹ to an integer we get the ASCII code for 5 (which is 53). A conversion usually involves some processing. 2.5.1 Converting to a string We often need to convert to a string. 2.5.1.1 ToString() The method ToString() can be used for any object. We may optionally control the format with a format string. Examples of ToString on an integer //No surprises here – it gives "3" 3.ToString(); //The stand currency format is used "£3.00" for the UK 3.ToString("c"); //Uses three digits both sides of the . "003.000" 3.ToString("000.000"); //Daisy chains a string method " 3" 3.ToString().PadLeft(5) duction to .NET Intro 2.5.1.2 String.Format() The Format method of the String class may be used to construct strings with variable components. Examples of use: Examples of String.Format // {0} is a place holder "3 men went to mow" String.Format("{0} men went to mow.",3) //"The time is now 23/06/04 12:30" String.Format("The time now is {0}.", DateTime.Now) //The place holder {1} crops up with different formats String.Format("I paid {0:c} on {1:%d} of {1:%MMM}.", 3,DateTime.Now)); In a string format {0} indicates the first parameter, {1} is the next… Following this indicator we can specify the format to be used after a : In the example above :c indicates currency ‐ £3.00. Agilent .NET Course: C# Basics 5
2.6 The Convert class The convert class includes many methods that may be used to convert from one data type to another: There are other mechanisms from translating. Some classes have a Parse method. 2.6.1 Exercises: Set the following variables: Variables to be used in the exercise int i = 99; DateTime w = Convert.ToDateTime("21 Jun 2004 12:30"); double d = 42.3; Use these values as input to one String.Format or ToString to produce each of the following: 1 Use i to produce ʺ0099ʺ i.ToString(ʺ0000ʺ) 2 Use w to produce ʺ21/06/2004 12:30:00ʺ – The default local date format. 3 Use w to produce ʺMondayʺ ‐ The day of the week. duction to .NET Intro 4 Use d to produce ʺ42.300ʺ ‐ To exactly 3 decimal places. 5 Use i to produce 63 – The hex value of 99 Agilent .NET Course: C# Basics 6
Page 1 and 2: Name: Course: Introduction to .NET
Page 3 and 4: Thus, we have three choices of shap
Page 5 and 6: Finally, for this section, Program
Page 7 and 8: 1.3.1 Win32 API The Win32 API libra
Page 9 and 10: VB VB ASP ASP ASP ASP VBA VBA VB VB
Page 11 and 12: Volume in drive C has no label. Vol
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Page 15 and 16: 1.4.2 Using the environment Figure
Page 17 and 18: Figure 1.17: Object browsing for ot
Page 19 and 20: 1.6 Basic elements of a C# program
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Page 23 and 24: 2 Module 2 Basics of C# 2.1 Introdu
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Page 31 and 32: 2.9 StreamReader The StreamReader c
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Page 35 and 36: 3 Arrays and Collections 3.1 Introd
Page 37 and 38: inputValues = new double[5]; which
Page 39 and 40: 4 is YELLOW 5 is GREEN Program 3.3
Page 41 and 42: 3.3 Reading from a CSV file One of
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Page 49 and 50: Sample Run 3.8 Average is 4.7142857
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Page 55 and 56: 4 Types and Debugging 4.1 Introduct
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5.2 Overloaded Methods An overloade
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5.5 Contributing to Intellisense We
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5.8 Throwing Exceptions We may deli
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5.11 Regular Expressions Use of reg
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The following problem appeared as E
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user enters an illegal filename (su
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5.15 Methods Tutorial We return to
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Name: Course: Introduction to .NET
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6.2 Cerebus The run time environmen
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protected override void UserRun() {
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Name: Course: Introduction to .NET
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choices of handle type (small or la
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Finally, for this section, Program
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} class Class1 { static void Main(s
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Mammals Increasing generalisation C
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} } static void Main() { Applicatio
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} public void ToLowerCase() { name=
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Program 7.8: using System; namespac
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Program 7.9: using System; namespac
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Sample Run Name: fred Name: FRED Ob
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8 More Objects 8.1 Introduction Thi
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Program 8.1: using System; interfac
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8.2.1 Combining interfaces New inte
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{ static void Main() { Circuit cir
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class Class1 { static void Main(str
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class Class1 { static void Main(str
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date: September 2003 ///change hist
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10 Day 5 pm 10.1 Contents Morning s
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We can create the required method i
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10.4 Any Others Term Example Explan
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uk.Gdp = 1000000000; int c = uk.Reg
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We keep a record of the country tha
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10.9 Tutorial duction to .NET Intro
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Complete set: Intro to C - Bill Buchanan

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