Pipes - Bianca - Calculator

Pipes_Bianca_Calculator.rb

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+# GOAL: Build a calculator command line interface (CLI) that allows a user to
+# perform simple arithmetic.
+
+#trying to incorporate new knowledge of creating methods
+#create a method per operation - currently feeling very repetitive.
+#perhaps a way to automate or loop through this process
+
+def add(num_1, num_2)
+  return num_1 + num_2
+end
+
+def subtract(num_1, num_2)
+  return num_1 - num_2
+end
+
+def multiply(num_1, num_2)
+  return num_1 * num_2
+end
+
+def divide(num_1, num_2)
+  if num_2 != 0
+    return num_1 / num_2
+  else
+    return "You cannot divide by 0 - The value is undefined."
+  end
+end
+
+def modulo(num_1, num_2)
+	return num_1 % num_2
+end
+
+def exponent(num_1, num_2)
+	return num_1 ** num_2
+end
+
+# function that will check for integer verfication
+def int_ver(num_input)
+ 	standard_int =*("0".."9")
+
+	num_input.each_char do |i|
+		if !standard_int.include?(i)
+			return false
+		end
+  	end
+
+	return num_input.to_i
+end
+
+# array of possible operation values as strings because gets.chomp uses strings as input
+op_arr = ["+", "add", "-", "subtract", "*", "multiply", "/", "divide", "%", "modulo", "exponent", "^", "**"]
+
+# gather user input: operation
+puts "What operation would you like to support? (can use symbols or word for operation)"
+op = gets.chomp.to_s.downcase
+
+# check for allowed operation values
+until op_arr.include?(op)
+  puts "I do not understand what operation you want me to do. Please reeneter."
+  op = gets.chomp.to_s
+end
+
+# gather user input: 2 number values
+puts "What two numbers would you like to perform an operation on?"
+
+# verify input is an integer value and if so, add to number array to store and access values
+numberArray = []
+counter = 0
+while counter < 2
+	input = gets.chomp
+	num = int_ver(input)
+	if num
+    	numberArray << num
+		counter += 1
+	else
+		puts "number is not an integer"
+		puts "Please enter a number."
+
+	end
+end
+
+#incorporate user input to give the result of the operation of two numbers
+
+answer = 0
+
+if op == "add" || op == "+"
+	if op == "add"
+		op = "+"
+	end
+	puts answer = add(numberArray[0], numberArray[1])
+elsif op == "subtract" || op == "-"
+	if op == "subtract"
+		op = "-"
+	end
+	puts answer = subtract(numberArray[0], numberArray[1])
+elsif op == "multiply" || op == "*"
+	if op == "multiply"
+		op = "*"
+	end
+	puts answer = multiply(numberArray[0], numberArray[1])
+elsif op == "divide" || op == "/"
+	if op == "divide"
+		op = "/"
+	end
+	puts answer = divide(numberArray[0], numberArray[1])
+elsif op == "modulo" || op == "%"
+	if op == "modulo"
+		op = "%"
+	end
+	puts answer = modulo(numberArray[0], numberArray[1])
+elsif op == "exponent" || op == "**" || op == "^"
+	if op == "exponent" || op == "^"
+		op = "**"
+	end
+	puts answer = exponent(numberArray[0], numberArray[1])
+else
+  puts "Operation input not clear. Please re-enter."
+end
+
+puts "#{numberArray[0]} #{op} #{numberArray[1]} = #{answer}"
+
+# Test & Verify
+
+# Before you submit your work it's important to test your program and ensure it's working properly.
+
+# To make sure your program works you will need to run your program and ensure:
+
+# The program adds numbers with both add and + - checked
+# The program subtracts numbers with both subtract and - - checked
+# The program adds numbers with both multiply and * - checked
+# The program adds numbers with both divide and / - checked
+# The program handles divide when attempting to divide by zero. - checked
+# The program handles erroneous input. For example the user might enter clown when asked to enter a number.
+# The program also needs to handle erroneous operators.
+
+# Optional Enhancements
+
+### DONE - Print out the formula in addition to the result, i.e. 2 + 2 = 4
+### DONE - Add support for the modulo operator (10 % 3 = 1).
+### Add support for computing exponents (2^4 = 2 * 2 * 2 * 2 = 16).
+# Gracefully handle unexpected user input:
+# What happens if the user input is nil (i.e., the user just pressed enter)?
+# What happens if the user tries to add hotdog to elephant?
+
+
+## Advanced
+# Make your program know when it needs to return an integer versus a float.
+# Add support for parentheticals, i.e. 10 / (5 + 5) = 1.