01_ruby_intro_answers.md

Ruby Intro Answer Sheet

Check your ruby version

Your ruby version:

Floats and integers

1. 3.0 / 2
   1. Expected (integer or float): Float
   2. Actual (integer or float): Float
   3. Answer: 1.5
2. 3 / 2.0
   1. Expected (integer or float): Float
   2. Actual (integer or float): Integer
   3. Answer: 1
3. 4 ** 2.0
   1. Expected (integer or float): Integer
   2. Actual (integer or float): Integer
   3. Answer: 16
4. 4.1 % 2
   1. Expected (integer or float): Float
   2. Actual (integer or float): Float
   3. Answer: 0.09999999999999964

Strings

1. "tom" * 3
   • Expected: tomtomtom
   • Actual: tomtomtom
2. "tom" + "tom"
   • Expected: tomtom
   • Actual: tomtom
3. "tom" + 1
   • Expected: tom1
   • Actual: no implict conversion of Fixnum to string
4. "tom" / 2
   • Expected: Error because dividing string by number
   • Actual: NoMethodError: undefined method `/' for "tom":String

Calculations in IRB

1. How many hours are in a year? 24 hrs per day * 365 days in year
   • Answer: $8,760
2. How many minutes are in a decade? 24 hours per day * 60 minutes per hour = $1,440 1440 minutes per day * 365 days in year = 525,600 525,600 minutes in year * 10 years
   • Answer: 5,256,000
3. How many seconds old are you? !--require "time" => true Time.now.to_i => 1550720751 dob.to_i => 616255200 Time.now.to_i - dob.to_i -->

• Answer 934465711

Beast Mode

1. Use interpolation to put your name on the screen Answer: echo "Tegan" + " Oar"
2. Make a new variable called 'siblings', set it's value to the number of siblings you have (integer) Answer: siblings = 3
3. Use code to put your number of siblings on the screen. Answer: puts siblings
4. Use interpolation to pretty it up, E.g.: “Total Siblings: 3” Answer: puts "Total siblings: #{3}"
5. Use code to increase your number of siblings by one. Answer: siblings = 3 + 1
6. Use interpolation again to put your new number of siblings on the screen Answer: puts "New number of siblings: #{siblings}"