Worshop 4

To do:

1. Spend some time moving your way through the 46 Ruby coding examples in the Ruby Tutorial with Code from http://www.fincher.org/tips/Languages/Ruby/


2. What are the syntax differences in the way that Ruby and Javascript use the if statement?
Below is a simple example comparing the basic syntax.
JavaScript
if (card > 21) {
document.write("busted");
} else if (card == 21) {
document.write("won");
} else {
document.write("continue");
}
Ruby
if card > 21
print "busted"
elseif card == 21
print "won"
else
print "continue"
end


3. While Ruby and Python are quite similar, can you find some similarities between Ruby and Javascript?

The main similarity between Ruby and Javascript is quite fundamental; they both have similar syntax and are object-oriented language.


Challenge Problems:

1. Create, test and debug a Ruby program called dognames.rb or catnames.rb to accept 3 names from the keyboard and to display each name on the screen in alphabetical order WITHOUT using a data structure such as a list.




2. Write a Ruby program called fizzbuzz.rb that prints the numbers from 1 to 100. But for multiples of three print "Fizz" instead of the number and for the multiples of five print "Buzz". For numbers which are multiples of both three and five print "FizzBuzz".





3. Compare the Ruby and Python versions of the dog years calculator:

#!/usr/bin/ruby
# The Dog year calculator program called dogyears.rb

def dogyears
# get the original age
puts “Enter your age (in human years): "
age = gets # gets is a method for input from keyboard
puts # is a method or operator for screen output

#do some range checking, then print result
if age <> 110
puts "Frankly, I don't believe you."
else
puts "That's", age*7, "in dog years."
end
dogyears

Python

#!/usr/bin/python
# The Dog year calculator program called dogyears.py

def dogyears():
# get the original age
age = input("Enter your age (in human years): ")
print # print a blank line

# do some range checking, then print result
if age <> 110:
print "Frankly, I don't believe you."
else:
print "That's", age*7, "in dog years."

### pause for Return key (so window doesn't disappear)
raw_input('press Return>')

def main():
dogyears()
main()

Comparsion:

Ruby Python
File extension rb py
Function quotation No quotation ():
Remark # #
Prompt Puts “ “ Input (“ “)
End of loop 'End' statement No need to put ‘End’ Statement