Branches - Clara

calculator_ext.rb

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+# method for input validation of numbers
+#new_num = nil # serves as a placeholder variable in case the user has to re-enter any numbers during the number_validation method
+
+def number_validation (input)
+  eval_num = nil  
+  until eval_num == "Pass" do
+    # transforms a copy of the user input to check against the original value
+    input_v = input.to_f*100
+    input_v = input_v.to_i.to_s
+    input_w = input.delete(".")
+    if input == input.to_f.to_s
+      eval_num = "Pass"
+    elsif input == input.to_i.to_s
+      eval_num = "Pass"
+    elsif input_v == input_w    
+      eval_num = "Pass"
+    else
+      print "Oh nos! You entered some non-number character. Enter a new one: "
+      input = gets.chomp
+    end
+  end 
+  return input
+end
+
+# stores possible user inputs for mathematical operators
+addition = %w[ADDITION ADD +]
+subtraction = %w[SUBTRACTION MINUS -]
+multiplication = %w[MULTIPLY MULTIPLICATION TIMES X *]
+division = %w[DIVISION DIVIDE /]
+exponent = %w[EXPONENT POWER ^ **]
+
+# greets the user and asks for an operator they'd like to use
+print "Hi, enter a mathematical operation you'd like to do: "
+operation = gets.chomp.upcase
+
+#evaluates the user input to see if it's valid
+until addition.include?(operation) || subtraction.include?(operation) || multiplication.include?(operation) || division.include?(operation) || exponent.include?(operation)
+  print "This is not a valid operator, please try again: "  
+  operation = gets.chomp.upcase
+end
+
+# gets the user's numbers and validates them
+print "Enter the first number: "
+input = gets.chomp
+new_input = number_validation(input)
+first_num = new_input  
+
+# gets the user's numbers and validates them
+print "Enter the second number: "
+input = gets.chomp
+new_input = number_validation(input)
+second_num = new_input  
+
+# runs the calculation and displays for the user the work
+case 
+when addition.include?(operation)
+  puts "#{first_num.to_f} + #{second_num.to_f} = #{first_num.to_f + second_num.to_f}"
+when subtraction.include?(operation)
+  puts "#{first_num.to_f} - #{second_num.to_f} = #{first_num.to_f - second_num.to_f}"
+when multiplication.include?(operation)
+  puts "#{first_num.to_f} x #{second_num.to_f} = #{first_num.to_f * second_num.to_f}"
+when division.include?(operation)
+  puts "#{first_num.to_f} / #{second_num.to_f} = #{first_num.to_f / second_num.to_f}"
+  if second_num.to_f == 0.0
+    puts "So...it is infinity, but next time, let's not try dividing by zero, yea? "
+  end
+when exponent.include?(operation)
+  puts "#{first_num.to_f} ** #{second_num.to_f} = #{first_num.to_f ** second_num.to_f}"
+end