1. Welcome to Visual Programming using C#
What the Course is About

2. Course info Instructor: Yrd. Doç. Dr. Cengiz Örencik
Course material
all the notes / codes will be shared there

3. Book Not required You may use any programming book on C#
Microsoft Visual C# .NET step by step
John Sharp and Jon Jagger

4. Grading Midterm 30% Inclass quizes (2) 20% (10+10) Final 50% Hws
Mostly coding
Self study
Not be graded

5. Aims to learn Developing an algorithmic way of thinking
The nature of object oriented programming
Operators, precedence
Class, objects, methods etc.
Building big programs using small ones.
Test/debug
Inheritance, polymorphism ….
GUI design
Toolbox and control properties
Event driven programming
Exception handling

6. Tentative Outline Classes (constructor, properties, access/modify)
Methods (overloading, pass by reference, scope of variables…)
Introduction to visual programming (textbox, buttons, checkbox, radiobuton, timer…)
Control statements (if-else, switch, while, for, do-while)
Arrays, strings (sorting, searching)
Recursion
Inheritance and Polymorphism
Generics (type independent)
Exception handling
Files and streams

7. Getting started
You will need an integrated development environment (IDE)
Download Visual Studio Community 2015
If you already have a running visual studio you may go on with it, they are more or less the same
If you prefer an open source IDE, you may use SharpDevelop
Almost the same interface with visual studio

8. Add 3 Number Lets do it from scratch First as console application
Next as Visual
Read input/write output

9. Data Types Char String Bool For single character
Digits, letters, symbols…
One byte (8 bit)
Can store 28 = 256 different values
String
Any set of chars (words, sentences)
Can be arbitrarily long
More tecnically, string is a class
Bool
True / false

10. Numeric Types int (short / long) signed versus unsigned integers
integer numbers
no infinity in computers 
limited range
4 bytes (32 bits) integer range:
–2,147,483, ,147,483,647 for 32-bit computers
why?
signed versus unsigned integers
you can put signed or unsigned keywords before the type
unsigned integers use the same amount of bits but ranges are different
32-bit: ,294,967,295 (232 –1)
Double
8 bytes (64 bits)
e21

11. Arithmetic Operations
Mixed type expressions
what if one operator is int other is double?
integer is converted into double before operation
5.0 * is 40.0
5 / is 0 (integer division)
5.0 / is 0.5 (real division)
10 – 8 is 2 (integer)
10 – is 2.0 (double)

12. Expressions with several operators
You can use parentheses in expressions to group them
Open ( and close ) parentheses should match
Rule 1: Parenthesized sub-expressions are evaluated first
inside to out
Rule 2: Within an expression/subexpression if there are several operators, use operator precedence,
evaluate * / % before + -
Rule 3: If the operators are in the same expression/subexpression and at the same precedence level, then associativity rule applies
evaluate operators from left-to-right
Examples
(5 - 3 * (7 - 3)) * is -56
10 / 2 * 6 / 2 + (5 - 3 * (2 - 1)) is 17

13. Expressions with several operators
Are the following expressions equivalent?
(40 – 32) * 5 / 9
(40 – 32) * (5 / 9)
NO, first one is 4, second one is 0
What about this?
(40 – 32.0) * 5 / 9
Operations are double operations. Result is
See the example
Arithmeticoperations – console
circleArea – Windows