Let's try Ruby!

1. Programming
Meeting #3
EEC: T.Hideyuki

2. Programming
Meeting #3
Review
Let’s Try Ruby!
What's next?
+

3. Programming
Meeting #3
Review
Function
Variable
Operation
I/O

4. Programming
Meeting #3
Variable
N
1
Assignment
N = 1
N + 2 is 3

5. Programming
Meeting #3
Variable
Let’s Try It in Ruby!
http://tryruby.org

6. Programming
Meeting #3
Variable http://tryruby.org

7. Programming
Meeting #3
Variable
a = 3
b = 2

8. Programming
Meeting #3
Variable
x = “Programming”
y = “Meeting”
Double quotes
Strings

9. Programming
Meeting #3
Variable
Strings
x = Programming
y = Meeting
ERROR

10. Programming
Meeting #3
Variable
Let’s see…
puts( variable
This is a “Function”
)

11. Programming
Meeting #3
Variable
Let’s see…
a
3
puts( )

12. Programming
Meeting #3
Operation

13. Programming
Meeting #3
Operation
+ - * / %

14. Programming
Meeting #3
Operation
+ - * / %
Add Sub Mul Div Mod

15. Programming
Meeting #3
Operation Let’s Try !
1 + 1
5 - 8
1.2 * 15.8
25 / 7
2014 % 6

16. Programming
Meeting #3
Operation
c = a - b
2
3
d = a + b + c
3
2
1

17. Programming
Meeting #3
Operation
Think
x = “Programming”
y = “Meeting”
x + y

18. puts( )
Programming
Meeting #3
Operation
Think
x = “Programming”
y = “Meeting”
x + y
ProgrammingMeeting

19. 40
Programming
Meeting #3
Operation
It means…
s = “13”
t = “27”
s + t is
“1327”
NOT
Double
quotes

20. Programming
Meeting #3
I/O

21. Programming
Meeting #3
I/O
DisplayKeyboard
Input Output

22. Programming
Meeting #3
I/O
File
Input
open( )File Name
/ Output
This is a “Function”.

23. Programming
Meeting #3
Function

24. Programming
Meeting #3
Function
puts()
open()

25. sqrt(
Programming
Meeting #3
Function
sin()
cos()
tan()
log()
exp()
atan2()
log10()
Math
Module / Library
)
Extension Pack!!!

26. Programming
Meeting #3
Function
Math
Module / Library
sqrt( ). Value
√ Value

27. Programming
Meeting #3
Function
Math
Module / Library
sqrt( ). Value
Math sin( ). Value
Math cos( ). Value
...

28. Programming
Meeting #3
What's next?

29. Programming
Meeting #3
What's next?
Make Functions

30. Programming
Meeting #3
Questions

31. Programming
Meeting #3
Thank you for Meeting!