Brenda Rios - Calculator - Octos

Project_1.rb

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+# definition of methods
+def add(num1,num2)
+  return num1 + num2
+end
+
+def subtract(num1,num2)
+  return num1 - num2
+end
+
+def multiply(num1,num2)
+  return num1 * num2
+end
+
+def divide(num1,num2)
+  return num1 / num2
+end
+
+def numberic?(string)
+  /[%\+\*\d]/.match(string)
+end
+
+def empty?(input)
+  if input.empty?
+    puts "You did not enter anything!"
+  end
+end
+
+def type?(input)
+  if /\A\d+\z/.match(input)
+    return "integer"
+  elsif /\A\d+\.\d+\z/.match(input)
+    return "float"
+  end
+end
+
+
+puts "Welcome to your calculator!\n"
+
+puts "I can add, subtract, multiply or divide\n"
+
+puts "Please enter the operator you want to use : add, + , subtract, - , multiply, * , divide , / "
+user_input = gets.chomp.downcase
+
+empty?(user_input)
+
+# to make sure the user input is a valid operator
+arr_operators = ["add","+", "subtract", "-", "multiply", "*" , "divide", "/"]
+
+attempt = 0
+while !arr_operators.include?(user_input)
+  if attempt < 3
+    attempt += 1
+    puts "Please enter a valid operator. You have #{(-attempt + 3) + 1} more attempts.\n"
+    puts "Operator options: add, subtract, multiply, divide, +, - , *, /"
+    user_input = gets.chomp
+  else
+    puts "Too many attempts..start the program again"
+    exit
+  end
+end
+
+print "Please enter value 1: "
+num1 = gets.chomp
+
+empty?(num1)
+
+until numberic? num1 do
+  puts "Please enter a numeric expression for value 1: "
+  num1 = gets.chomp
+end
+
+print "\nPlease enter value 2: "
+num2 = gets.chomp
+
+empty?(num1)
+
+until numberic? num2 do
+  puts "Please enter a numeric expression for value 2: "
+end
+
+# To handle when user attempts to divide by zero.
+if user_input == "divide" || user_input == "/"
+  while num2 == 0
+    puts "Cannot divide by 0. Please enter again the divisor"
+    num2 = gets.chomp
+  end
+end
+
+case user_input
+when "add", "+"
+  puts "\nAnswer: #{results = add(eval(num1), eval(num2))}"
+  puts "#{num1} + #{num2} = #{results}"
+when "subtract", "-"
+  puts "\nAnswer: #{results = subtract(eval(num1),eval(num2))}"
+  puts "#{num1} - #{num2} = #{results}"
+when "multiply", "*"
+  puts "\nAnswer: #{results = multiply(eval(num1),eval(num2))}"
+  puts "#{num1} * #{num2} = #{results}"
+when "divide", "/"
+  puts "\nAnswer: #{results = divide(eval(num1),eval(num2))}"
+  puts "#{num1} / #{num2} = #{results}"
+end
+
+# this will allow the program to know if the result should be printed as a float or an integer
+if type?(num1) == "float"
+  results.to_f
+elsif type?(num1) == "integer" && type?(num2) == "integer"
+  results.to_i
+end