... method. It indicates that for occurs at character 15 of C# Programming for
59
Figure 2.5: The convert object can convert nearly any variable type to any other variable type.
The Convert class is part ... 102
Adding a Constructor to the Critter Class 103
Creating the CritViewer Class 104
Reviewing the Static Keyword 105
Calling a Constructor from the Main() Method 106
Examining CritViewer’s Constructor ... Inheritance to Make New Classes 111
Creating a Class to View the Clone 112
Creating the Critter Class 113
Improving an Existing Class 113
Introducing the Glitter Critter 114
Calling the Base Class’s Constructors...
...
learning Objective -C. Objective -C is designed more for program efficiency and less for
human readability, which means that writing and reading Objective -C instructions can
look cryptic at times. ... transforming
your Mac app ideas into real applications.
Mac Programming
for Absolute Beginners
Wallace Wang
Get started with Objective -C, Cocoa,
and Xcode on the Mac
www.it-ebooks.info
CHAPTER 1: Understanding ...
applications.
Cocoa-Applescript Application: Creates an application based on the
AppleScript programming language. (This option is for advanced Mac
programmers.)
Quartz Composer Application:...
...
shows the ASCII table of characters. Because 1 byte can represent 256 characters, this
works well for Western characters. For example, hexadecimal 20 represents a space.
Hexadecimal 7D represents ... where the code is executed. Eventually, some condition is
reached that causes isTrue to become FALSE. After completing all the code in the loop
body, the condition (isTrue) is checked once more, ... and Instances in Alice
A group of objects with the same properties and same methods (actions) are called a
class. For example, we could have a class called Airplane. In this class, we could have...
... Console.WriteLine("Không thu c tất ccc trường hợp trên");
break;
}
C u tr c vòng lặp trong lập trình C#
C# cung c p cc cấu tr c vòng lặp chương trình
While
Do… while
For
Foreach
Sau ... trong C# , c ch khai báo biến, mảng trong C#
C u tr c điều kiện, lựa chọn if … else và switch… case
C u tr c vòng lặp while, do…while, for, foreach
Bài tập tự th c hiện
Để c ng c kiến ...
{
return cmd.ExecuteReader();
}
else
{
using (OleDbConnection conn = GetConnection())
{
cmd.Connection = conn;
datareader = cmd.ExecuteReader();
return cmd.ExecuteReader();...
... Choices
Choice c1 = new Choice();
c1 .add(“Soup”);
c1 .add(“Salad”);
Choice c2 = new Choice();
c2 .add(“Java”);
c2 .add( C+ +”);
c2 .add(“HTML”);
c2 .add(“JavaScript”);
c2 .add(“COBOL”);
c2 .add(“FORTRAN”);
Choice ... you add items to it:
Choice myChoice = new Choice();
myChoice.add(“Work”);
myChoice.add(“Play”);
myChoice.add(“Sleep”);
This snippet of code constructs a Choice, called myChoice, and then adds three
items ... common methods.
The
ChoiceTest application creates four Choice objects, c1 , c2 , c3 , and c4 . There
is nothing out of the ordinary here except
c3 shows that you can change its col-
ors and
c4 ...
... the action command associated with action events.
* @param command The action command.
*/
public void setActionCommand(String command) {
actionCommand = command;
}
/**
* Gets the action command ... the color used for the control color
* @return The color used for the control color.
*/
public Color getControlColor() {
return control;
}
/**
* Gets the color used for highlighting effects.
* ... Properties, and
then Appearance, you can choose a color scheme for your GUI. You can even go
as far as specifying your own custom scheme. So the
SystemColor colors specify
these colors and if you want...
... program using gcc.
From the Cygwin UNIX shell, type the following:
gcc hello .c
If your program compiles successfully, gcc will create a new executable file called a.exe.
If you are unsuccessful in ... programming in C. Specifically, I will teach you the basics of
C programming using non-graphical text editors and the ANSI C compiler gcc. You will learn
fundamental programming concepts such as variables, ... this case the
computer screen, another new line is written.
Table 1.2 describes some common escape sequences.
10
C Programmingfor the Absolute Beginner, Second Edition
Escape sequences
are specially...
... ASCII (American Standard Code for
Information Interchange) character set. For a listing of common ASCII character codes, see
Appendix D, “Common ASCII Character Codes.”
ASCII
ASCII
or American ... Standard Code for Information Interchange is noted for its character set,
which uses small integer values to represent character or keyboard values.
In C, character variables are created using the
char
... character sets known
as conversion specifiers.
Conversion specifiers are comprised of two characters: The first character is the percent
sign (
%
), and the second is a special character that tells the...
... the ASCII value for uppercase
letter A is not the same as the ASCII value for lowercase letter a. (To see a listing of common
ASCII characters, visit Appendix D, “Common ASCII Character Codes.”)
To ... 'A' || cResponse == 'a' )
Checking for a Range of Values
Checking for a range of values is a common programming practice for input validation. You
can use compound conditions and ... bug occurred because after the appropriate
case
statement is matched to the
switch
variable, the
switch
structure continues processing each
case
statement thereafter.
72
C Programming for...
... balance
At least four occasions require you to access the customer’s balance. Writing code structures
every time you need to access someone’s balance doesn’t make sense, because you can write
C Programming ... for the Absolute Beginner, Second Edition
112
common structured programming techniques and concepts. After reading this section, you
will be ready to build your own C functions.
Structured programming ... transac-
tions a customer might perform at a single visit to an ATM.
ã Deposit monies into a checking account
ã Transfer funds from a checking to a savings account
ã Withdraw monies from checking
ã...