#a class that checkes if values are numeric
class String
  def is_number?
    true if Float(self) rescue false
  end
end

#1 Prompt for a number. If the number is greater than 70, print PASSING; otherwise, print NOT PASSING.

# retrieve grade
print "Enter a grade number:"
grade = gets.chomp

#method to check if grade is numeric
if !grade.is_number?
  #if grade is not numeric, ask user for numeric value
  while !grade.is_number?
    print "Looks like you didn't enter a number. Re-enter a number: "
    grade = gets.chomp
  end
end

#change numeric string to integer
grade = grade.to_i

#check if passing
if grade > 70
  print "PASSING"
  else print "NOT PASSING"
end
puts

#2 Prompt for a string. If the string is equal to green, print GO, otherwise, print STOP.

print "Pick a color:"
color = gets.chomp.downcase

if color === "green"
  print "GO"
  else print "STOP"
end
puts

#3 Prompt for a number. If the number is even, print EVEN, otherwise, print ODD.

print "Enter a random number:"
number = gets.chomp.to_i

#check to be sure number is numerical

if number % 2 === 0
  print "EVEN"
  else print "ODD"
end
puts

#4 Prompt for a number. If the number is evenly divisible by 5, print MULTIPLE OF 5, otherwise, print NOT A MULTIPLE OF 5.

print "Enter another number:"
num = gets.chomp

#check to be sure number is numerical
while !num.is_number?
    print "Looks like you didn't enter a number. Re-enter a number. "
    num = gets.chomp
  end

#num string to integer
num = num.to_i

if num % 5 === 0
  print "MULTIPLE OF 5"
  else print "NOT A MULTIPLE OF 5"
end
puts

#5 Prompt for a number. If the number is less than 10, print ONE DIGIT. If the number is 100 or greater, print THREE DIGITS, otherwise print TWO DIGITS.

print "Enter one more number:"
digits = gets.chomp

#check to be sure number is numerical
while !digits.is_number?
    print "Looks like you didn't enter a number. Re-enter a number. "
    digits = gets.chomp
  end

#numerical string to integer
digits = digits.to_i

if digits < 10
  print "ONE DIGIT"
  elsif digits >= 100
    print "THREE DIGITS"
  else print "TWO DIGITS"
end
puts

#6 Prompt for a jersey number. If that number is 12, 71, or 80, print That number is retired from the Seattle Seahawks!, otherwise do nothing.

print "Enter a jersey number:"
jersey_num = gets.chomp

#check to be sure number is numerical
while !jersey_num.is_number?
    print "Looks like you didn't enter a number. Re-enter a number. "
    jersey_num = gets.chomp
  end

#change nemeric string to integer
jersey_num = jersey_num.to_i

if jersey_num === 12 || jersey_num === 71 || jersey_num === 80
  puts "That number is retired from the Seattle Seahawks!"
end
puts

#7 Prompt for a state. If the state is Washington, Oregon, or Idaho, print This state is in the PNW, otherwise print You should move to the PNW; it’s great here!

print "Enter a U.S. State:"
state = gets.chomp.downcase

if state === "washington"
  print "This state is in the PNW!"
  elsif state === "oregon"
    print "This state is in the PNW!"
  elsif state === "idaho"
    print "This state is in the PNW!"
  else print "You should move to the PNW; it's great here!"
end
puts

#8 Prompt for a one of the following: SHORT, TALL, GRANDE, VENTI. Print out the number of ounces that drink includes (8, 12, 16, 20 respectively).

print "Which size drink would you like?: short, tall, grande, or venti?"
size = gets.chomp.downcase

#if size is not a correct value, ask for correct value
while size != "short" && size != "tall" && size != "grande" && size != "venti"
  print "Looks like you didn't enter a matching size. Please re-enter:"
  size = gets.chomp.downcase
end

if size === "short"
  print "8 ounces"
  elsif size === "tall"
    print "12 ounces"
  elsif size === "grande"
    print "16 ounces"
  elsif size === "venti"
    print "20 ounces"
end
puts

#9 Prompt for rate of pay and hours worked. Calculate gross pay. Provide time-and-a-half for hours worked beyond 40 (e.g., if you get paid $10/hr and work 45 hours in a week, you would gross $475 (40 x 10 + 5 x 15).

print "How many hours did you work this week?"
hours = gets.chomp

#check to be sure number is numerical
while !hours.is_number?
    print "Looks like you didn't enter a number. Re-enter a number. "
    hours = gets.chomp
  end

#string to integer
hours = hours.to_i

print "How much do you get paid an hour?"
pay_rate = gets.chomp

#check to be sure number is numerical
while !pay_rate.is_number?
    print "Looks like you didn't enter a number. Re-enter a number. "
    pay_rate = gets.chomp
  end

#string to integer
pay_rate = pay_rate.to_i

overtime = (hours - 40) * pay_rate * 1.5

if hours > 40
  gross_pay = 40 * pay_rate + overtime
  print "Your gross pay is: $" + gross_pay.to_s
    else gross_pay = hours * pay_rate
      print "Your gross pay is: $" + gross_pay.to_s
end
puts

#10 Rewrite the solution to the previous problem adding this modification: do not process any employee if their hours worked is greater than 60, instead display the message Please see manager.

print "How many hours did you work this week?"
hours = gets.chomp

#check to be sure number is numerical
while !hours.is_number?
    print "Looks like you didn't enter a number. Re-enter a number. "
    hours = gets.chomp
  end

#string to integer
hours = hours.to_i

print "How much do you get paid an hour?"
pay_rate = gets.chomp

#check to be sure number is numerical
while !pay_rate.is_number?
    print "Looks like you didn't enter a number. Re-enter a number. "
    pay_rate = gets.chomp
  end

#string to integer
pay_rate = pay_rate.to_i

overtime = (hours - 40) * pay_rate * 1.5

if hours > 60
  print "Please see manager."
  elsif hours > 40
    gross_pay = 40 * pay_rate + overtime
    print "Your gross pay is: $" + gross_pay.to_s
    else gross_pay = hours * pay_rate
      print "Your gross pay is: $" + gross_pay.to_s
end