Branches - Paige

calculator.rb

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+# Calculator Program
+
+# stores valid input options for math operations
+valid_maths = [
+  "add",
+  "+",
+  "subtract",
+  "-",
+  "multiply",
+  "*",
+  "divide",
+  "/",
+  "exponent",
+  "^",
+  "modulo",
+  "%"
+]
+
+# method for text displaying available math options
+def maths_text
+  puts "  Add (+)"
+  puts "  Subtract (-)"
+  puts "  Multiply (*)"
+  puts "  Divide (/)"
+  puts "  Exponent (^)"
+  puts "  Modulo (%)"
+end  
+
+# displays welcome message
+puts "Welcome to the Calculator Program!"
+
+# displays available math operations 
+# asks user to input a math operation
+puts "Please select one of the following options: "
+maths_text
+print "Selection: "
+operation = gets.chomp.downcase
+
+until valid_maths.include?(operation)
+  puts "I can't do that. I only know how to:"
+  maths_text
+  print "Which operation do you want me to perform? "
+  operation = gets.chomp.downcase
+end
+
+# asks user to provide a number
+print "First number: "
+num_1 = gets.chomp
+until num_1.to_i.to_s == num_1 || num_1.to_f.to_s == num_1
+  puts "That's not a number. Try again."
+  print "First number: "
+  num_1 = gets.chomp
+end
+
+# asks user to provide a second number
+print "Second number: "
+num_2 = gets.chomp
+until num_2.to_i.to_s == num_2 || num_2.to_f.to_s == num_2
+  puts "That's not a number. Try again."
+  print "Second number: "
+  num_2 = gets.chomp
+end
+
+# asks user to state if result should be integer or float
+print "Do you want the result as an integer? "
+result_integer = gets.chomp.downcase
+
+case result_integer
+  when "yes", "y"
+    num_1 = num_1.to_i
+    num_2 = num_2.to_i
+  when "no", "n"
+    num_1 = num_1.to_f
+    num_2 = num_2.to_f
+end
+
+# executes and prints math operation
+puts "\n--CALCULATION--"
+case operation
+  when "add", "+"
+    result = num_1 + num_2
+    puts "#{num_1} + #{num_2} = #{result}"
+  when "subtract", "-"
+    result = num_1 - num_2
+    puts "#{num_1} - #{num_2} = #{result}"
+  when "multiply", "*"
+    result = num_1 * num_2
+    puts "#{num_1} * #{num_2} = #{result}"
+  when "divide", "/"
+    if num_2 == 0
+      puts "ERROR -- You can't divide by 0!"
+    else  
+      result = num_1 / num_2
+      puts "#{num_1} / #{num_2} = #{result}"
+    end
+  when "exponent", "^"
+    result = num_1 ** num_2.to_i
+    puts "#{num_1} ^ #{num_2} = #{result}"
+  when "modulo", "%"
+    result = num_1 % num_2
+    puts "#{num_1} % #{num_2} = #{result}"
+end