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Ampers: Zheng Cao #34

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0afd990
Finish basic version of the program
2020dream Feb 7, 2018
0ca3d62
Add formular print-out
2020dream Feb 7, 2018
39ae7c6
Change term second integer to divisor for division
2020dream Feb 7, 2018
0b852da
Add support for computing exponents
2020dream Feb 7, 2018
32d236f
Add support for the modulo operator
2020dream Feb 7, 2018
e44c00a
Add support for distinguishing integer and float
2020dream Feb 7, 2018
cffac61
Finish major refactoring
2020dream Feb 7, 2018
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88 changes: 88 additions & 0 deletions calculator.rb
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Original file line number Diff line number Diff line change
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# Welcome message
puts "Welcome to the calculator program."

# Instruction for choosing an operation
puts "What operation do you want to do? Please choose one from the following list: "
operations = ["add", "+", "subtract", "-", "multiply", "*", "divide", "/", "^", "%"]
puts operations

# Helper method to check user's choice
def user_choice_check choices
user_choice = gets.chomp
until choices.include?(user_choice)
puts "Please make a valid choice: "
user_choice = gets.chomp
end
return user_choice
end

# Collect user's choice for operations
user_operation = user_choice_check operations

# Instruction for choosing a number type
puts "What type of number are you entering? Please choose one from the following list: "
number_types = ["integer", "float"]
puts number_types

# Collect user's choice for number types
user_number_type = user_choice_check number_types

# Helper method to check integer input
def integer_check
integer_string = gets.chomp
integer = integer_string.to_i
until integer.to_s == integer_string
print "This isn't an integer. Please provide a valid input: "
integer_string = gets.chomp
integer = integer_string.to_i
end
return integer
end

# Helper method to check float input
def float_check
float_string = gets.chomp
float = float_string.to_f
until float_string.include?(".") && (float.to_s == float_string)
print "This isn't a float. Please provide a valid input: "
float_string = gets.chomp
float = float_string.to_f
end
return float
end

# Collect numbers from user
case user_number_type
when "integer"
print "Please provide the first integer: "
first_number = integer_check
print "Please provide the second integer: "
second_number = integer_check
when "float"
print "Please provide the first float: "
first_number = float_check
print "Please provide the second float: "
second_number = float_check
end

# Calculate and output result
puts "Here is the result: "
case user_operation
when "add", "+"
puts "#{first_number} + #{second_number} = #{first_number + second_number}"
when "subtract", "-"
puts "#{first_number} - #{second_number} = #{first_number - second_number}"
when "multiply", "*"
puts "#{first_number} * #{second_number} = #{first_number * second_number}"
when "divide", "/"
if second_number == 0
puts "For division, the divisor cannot be 0."
else
puts "#{first_number} / #{second_number} = #{first_number / second_number}"
end
when "^"
puts "#{first_number}^#{second_number} = #{first_number ** second_number}"
when "%"
puts "#{first_number} % #{second_number} = #{first_number % second_number}"
end
puts "Thank you for using the Calculator program."