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calculator.rb

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+#Calculator Program: Week1 day4
+
+#METHODS
+def add(a, b)
+  return "#{a} + #{b} = #{a + b}"
+end
+
+
+def subtract(a, b)
+  return "#{a} - #{b} = #{a - b}"
+end
+
+
+def multiply(a, b)
+  return "#{a} * #{b} = #{a * b}"
+end
+
+
+def divide(a, b)
+  a = a.to_f
+  b = b.to_f
+  if b == 0
+    puts "Undefined."
+  else
+    return "#{a} / #{b} = #{a / b}"
+  end
+end
+
+def mod(a, b)
+  return "#{a} % #{b} = #{a % b}"
+end
+
+def exp(a, b)
+  return "#{a} ** #{b} = #{a ** b}"
+end
+
+
+def f_or_i(number)
+  if number.include?(".")
+    return number.to_f
+  else
+    return number.to_i
+  end
+end
+
+def splitting(input)
+  return input.split(" ")
+end
+
+def compare(newness, original)
+  if newness.to_s != original
+    puts "EEP! I'm going to *gracefully* convert your string to a 0 and multiply that."
+  end
+end
+#if I can get the the parenthesis contained in one place
+
+
+#USER INTERFACE
+puts "Enter your equation. You must put spaces between numbers and operations."
+operation = gets.chomp
+
+until operation.include?("add") || operation.include?("+") || operation.include?("sub") ||
+  operation.include?("-") || operation.include?("mul") || operation.include?("*") ||
+  operation.include?("divide") || operation.include?("/") || operation.include?("%") ||
+  operation.include?("mod") || operation.include?("**") || operation.include?("exp") || operation.include?("power")
+  puts "Sorry, invalid operation. Please input your equation again."
+  operation = gets.chomp
+end
+
+if operation.include?(" ")
+  operation_modified = splitting(operation)
+else
+  puts "Sorry, please enter your equation with spaces."
+end
+#
+# if operation.include?("(")
+#     first_eval = operation.slice(operation.index("(")..operation.index(")")).split("")
+#     first_eval.delete(" ")
+#     first_eval.delete("(")
+#     first_eval.delete(")")
+#     puts "I made it through the loop. The array is #{first_eval}"
+#
+#     num3 = f_or_i(first_eval[0])
+#     num4 = f_or_i(first_eval[2])
+#
+#     puts "here's num3: #{num3}."
+#
+#     if first_eval.include?("exp") || operation.include?("**") || operation.include?("power")
+#       num2 = exp(num3, num4)
+#     elsif first_eval.include?("mutliply") || operation_modified[1] == "*"
+#       num2 = multiply(num3, num4)
+#     elsif first_eval.include?("divide") || operation.include?("/")
+#       num2 = divide(num3, num4)
+#     elsif first_eval.include?("add") || operation.include?("+")
+#       puts "it's addition!"
+#       num2 = add(num3, num4)
+#     elsif first_eval.include?("subtract")|| operation.include?("-")
+#       puts "It's subtraction!"
+#       num2 = subtract(num3, num4)
+#     elsif first_eval.include?("%") || operation.include?("mod")
+#       num2 = mod(num3, num4)
+#     end
+#     puts num2
+#
+#
+#
+# elsif operation.length == 3
+#
+
+
+  num1 = f_or_i(operation_modified[0])
+  num2 = f_or_i(operation_modified[2])
+
+  compare(num1, operation_modified[0])
+  compare(num2, operation_modified[2])
+
+
+  if operation.include?("exp") || operation.include?("**") || operation.include?("power")
+    puts exp(num1, num2)
+  end
+
+  if operation.include?("mutliply") || operation_modified[1] == "*"
+    puts multiply(num1, num2)
+  end
+
+  if operation.include?("divide") || operation.include?("/")
+    puts divide(num1, num2)
+  end
+
+  if operation.include?("add") || operation.include?("+")
+    puts add(num1, num2)
+  end
+
+  if operation.include?("subtract")|| operation.include?("-")
+    puts subtract(num1, num2)
+  end
+
+  if operation.include?("%") || operation.include?("mod")
+    puts mod(num1, num2)
+
+  end
+
+
+#end
+
+
+#
+# handles
+# add/+
+# subtract/-
+# divide/ /
+# multiply/*
+# handles division by 0
+# handles mod and exponents
+#adding all on one line!!
+#handles incorrect user input
+
+##Still needs to handle parentheticals