Stef Gunderson -- Calculator -- Carets

calculator_stef.rb

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+# Define methods first.
+# Create function to deal with attempts to divide by zero.
+def add(x,y)
+  return x + y
+end
+def sub(x,y)
+  return x - y
+end
+def multiply(x,y)
+  return x * y
+end
+def divide(x,y)
+  if x == 0 || y == 0
+    puts "Please try another computation, we don't divide by zero around here."
+    exit
+  end
+  return x / y
+end
+
+
+# Welcome user to the calculator program
+# Give the user some instruction on what it is the program will do and what kind of input is necessary from the user.
+puts "Welcome to the handy dandy calculator!"
+puts "\nThis amazing device will add, subtract, multiply, and divide all the things!"
+puts "\nIf you want to use a word or a symbol (i.e. +, -, *, /), it's up to you."
+
+# How to handle erroneous input - while loop or specify input type?
+# Start by asking user for the type of calculation they would like to do - User input.
+puts "\nWhat kind of calculation would you like to do?"
+operation = gets.chomp
+
+# Ask for the first number to be calculated - User input.
+puts "\nGive me your first number please."
+n1 = gets.chomp.to_i || gets.chomp.to_f
+
+# Ask for the second number to be calculated - User input.
+puts "\nNow for your second number."
+n2 = gets.chomp.to_i || gets.chomp.to_f
+
+# If/elsif statements, which also call on methods created earlier.
+# Create ability to use words and symbols for calculations.
+if operation == 'add' || operation == '+'
+  ret = add(n1,n2)
+  puts "#{n1} + #{n2} = #{ret}"
+elsif operation == 'sub' || operation == '-'
+  ret = sub(n1,n2)
+  puts "#{n1} - #{n2} = #{ret}"
+elsif operation == 'multiply' || operation == '*'
+  ret = multiply(n1,n2)
+  puts "#{n1} * #{n2} = #{ret}"
+elsif operation == 'divide' || operation == '/'
+  ret = divide(n1,n2)
+  puts "#{n1} / #{n2} = #{ret}"
+end
+
+# Thank user for using calculator.
+puts "Thank you for using my extraordinarily simplistic calculator."
+puts "Have a good day!"