Create Jessica Owens -- Carets

Jessica Owens -- Carets.rb

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+### CALCULATOR EXERCISE
+
+## DEFINE VARIABLES
+operators = {
+  "+" => ["addition", "add", "+", "plus", "and", "ajoute"],
+  "-" => ["subtract", "subtraction", "-", "minus", "less", "moins"],
+  "*" => ["multiply", "multiplication", "times", "*", "fois"],
+  "/" => ["divide", "division", "/", "divided by", "per", "over", "divise"],
+  "^" => ["square", "power", "^", "power of", "to the power of", "squared", "carre", "to the"],
+  "%" => ["modulus", "modulo", "remainder", "remainder of", "rem", "%", "mod"]
+}
+
+$op_display = "- add (+)
+- subtract (-)
+- multiply (*)
+- divide (/)
+- square (^)
+- modulus (%)"
+
+## DEFINE METHODS
+# Checking for included operations
+def check_ops(input, reqs) # where input is what we are testing & reqs is an array of values for which we are checking
+  check = false
+  until check
+    reqs.each do |req|
+      check = true if input == req
+    end
+
+    if !check
+      puts "That is not a valid option. Please use one of the following:\n#{$op_display}"
+      print "What operator would you like to use? "
+      input = gets.chomp
+    end
+  end
+
+  return input
+end
+
+# Checking for numbers
+def check_vals(input)
+  until !check_neg(input).gsub(".","").match?(/\D/) && input.strip.match?(/\d/) # [] Fix: Known issue- substitution allows for entries such as 3.0.5 to pass
+    print "That is not a valid number. Please select another number: "
+    input = gets.chomp
+  end
+
+  return input
+end
+
+# Perform calculations
+def calculate(op,a,b)
+  case op
+  when "+"
+    return a + b
+  when "-"
+    return a - b
+  when "*"
+    return a * b
+  when "/"
+    return a / b
+  when "^"
+    return a ** b
+  when "%"
+    return a % b
+  end
+end
+
+
+## EXECUTION
+# Get User input
+puts "Welcome to a simple calculator? You can use the following operators:\n#{$op_display}"
+
+
+print "Please enter your first value: "
+val1 = check_vals(gets.chomp)
+
+print "Choose your operator: "
+# user_op = gets.chomp
+user_op = check_ops(gets.chomp, operators.values.flatten)
+disp_op = user_op # could be set to "", but just to be safe
+
+# Convert user_op to symbol
+operators.each do |key, value|
+    disp_op = key if value.include? user_op
+end
+
+print "Please select your second value: "
+val2 = check_vals(gets.chomp)
+
+# Check to see if they're trying to divide by zero
+while (disp_op == "/" || disp_op == "%") && val2.to_f == 0
+  print "You cannot divide by zero. Select another value to divide by: "
+  val2 = check_vals(gets.chomp)
+end
+
+# Display equation
+if disp_op == "^" # Check if operator is ^ for formatting
+  puts "This is your equation: #{val1.strip}#{disp_op}#{val2.strip}"
+else
+  puts "This is your equation: #{val1.strip} #{disp_op} #{val2.strip}"
+end
+
+# Display results
+return_float = calculate(disp_op, val1.to_f, val2.to_f)
+return_integer = calculate(disp_op, val1.to_i, val2.to_i)
+
+unless return_integer == return_float
+  puts "#{return_float}\n"
+else
+  puts "#{return_integer}\n"
+end
+
+
+## Plan for allowing parentheticals
+# A. refactor to allow inline entry, split apart string into components (manage improper entry methods)...
+# B. Allow for someone to enter () either together to indicate a group of entries will be processed together then passed through, and allow them to tell you when to exit such parentheticals (ie "exit") or to let them open a parens and check for a closed parens, validate entry and process, then return value for next part of calculation.
+# [] Either way, would need to give explicit, simple human instructions for the users to understand capabilities.
+# [] Formatting display of parentheticals similar to "^"...
+
+
+### PROMPT
+# Build a calculator command line interface (CLI) that allows a user to perform simple arithmetic.
+
+### Baseline
+# The program should ask the user for an operation (string or numeric symbol) and two numbers.
+
+### Primary Requirements
+# [X] The program should use the input operation and two numbers to provide the result of applying the operation to the two numbers.
+# [X] The program should have support for these four operations: addition, subtraction, multiplication, and division.
+# [X] The program should accept both the name (add) and the symbol (+) for each possible operation.
+
+### Test & Verify
+# [X] 1. The program adds numbers with both add and +
+# [X] 2. The program subtracts numbers with both subtract and -
+# [X] 3. The program adds numbers with both multiply and *
+# [X] 4. The program adds numbers with both divide and /
+# [X] 5. The program handles divide when attempting to divide by zero.
+# [X] 6. The program handles erroneous input. For example the user might enter clown when asked to enter a number.
+# [X] 7. The program also needs to handle erroneous operators.
+
+### Optional Enhancements
+# [X] Print out the formula in addition to the result, i.e. 2 + 2 = 4
+# [X] Add support for computing exponents (2^4 = 2 * 2 * 2 * 2 = 16).
+# [X] Add support for the modulo operator (10 % 3 = 1).
+# [n/a] Gracefully handle unexpected user input:
+# [n/a] What happens if the user input is nil (i.e., the user just pressed enter)?
+# [n/a, handled by 6] What happens if the user tries to add hotdog to elephant?
+# [X] Make your program know when it needs to return an integer versus a float.
+# [] Add support for parentheticals, i.e. 10 / (5 + 5) = 1.