Variables, Types and Operators
On seeing the Matrix
Contents of fun
- How computers work?
- Inside an Android app
- Variables
- Types
- Operators
- Summary
Bad joke of the day
Programming is like sex:
One mistake and you have to support it for the rest of your life
How computers actually work?
010101111
111101010
Bits? Why bits?
When I press "Run" it goes like this
Break time
(10 mins)
How variable variables are?
-
Variables are holders of information (bits)
-
Information can be changed at any time
- Information can be retrieved from variables
The magic of variables
x = 4;name = "Polina"weight = 5.45Are you my (data) type?
- Why we need types?
- Why Java has types?
- How primitive a type can be?
You shall not pass...
double polinaRealAge = 67.9;the type check!
The mighty integer...
int polinaAge = 67;Doing it with precision
String polinaName = "Polina";
// Hmm... am I clever enough for you?Typing something "really" useful
You shall not pass...
the type check!
Ready for the simplest? True or false?
boolean readyToStart = true;Operators - programmer's best nightmare
- They tell the computer to carry out specific operation
- Doing mathematical operations is (almost) easy with them
Show `em to me!
What the answer is?
int c = 60 + 9;The meaning of life is...
int c = 50 - 8;They multiply
int c = 111 * 6;Don't try this at home?
int c = 1000 / 0;The Hungry Minion
Time to code some
Summary
- Variables are holders of information
- Types tell us what information
a variable holds - Operators help you do work
on defined variables