Create calculator_1.rb

calculator_1.rb

@@ -0,0 +1,113 @@
+# The program should use the input operation and
+# two numbers to provide the result of applying the operation to the two numbers.
+#
+# The program should have support for these
+# four operations: addition, subtraction, multiplication, and division.
+# The program should accept both
+# the name (add) and the symbol (+) for each possible operation.
+
+# acceptable operators
+#this is inelegant I know, I ran out of time!
+operators = [ "\+","\-","\*","\/","divide","DIVIDE","Divide","Div","DIV",
+  "div","add","addition","Add","ADD","ADDITION","Addition",
+  "subtract","Subtract","sub","Sub","SUB","SUBTRACT","mult",
+  "multiply","Multiply","MULTIPLY"
+]
+
+# methods
+def add(num_one, num_two)
+  return convert_input(num_one) + convert_input(num_two)
+
+end
+
+def subtract(num_one, num_two)
+  return convert_input(num_one) - convert_input(num_two)
+
+end
+
+def multiply(num_one, num_two)
+  return convert_input(num_one) * nconvert_input(num_two)
+
+end
+
+def divide(num_one, num_two)
+  return convert_input(num_one)/ convert_input(num_two)
+
+end
+# need to change the reg exp to reject things like punctuation
+def num_check(first_num)
+
+  while first_num =~ /[a-zA-Z]/
+    print "That is not a valid number. Please Enter a number."
+    first_num = gets.chomp
+
+  end
+
+end
+
+def second_num_check(second_num)
+  while second_num =~ /[a-zA-Z]/
+    print "That is not a valid number. Please Enter a number."
+    second_num = gets.chomp
+
+  end
+
+end
+
+# converts user input to a numeral.
+def convert_input(string)
+  if string.include?(".")
+    return string.to_f
+  else
+    return string.to_i
+
+  end
+end
+
+# gets user input
+puts "I'm a calculator."
+
+print "\nenter a number\s"
+first_num = gets.chomp
+
+# checks if user input is a number
+num_check(first_num)
+
+print "\ndo you want to add, subtract, multiply or divide\s?"
+operation = gets.chomp
+
+until operators.include?(operation)
+  print "The calculator does not recognize your input. Please put in an appropriate operator."
+  operation = gets.chomp
+
+end
+
+print "\nenter another number\s"
+second_num = gets.chomp
+# checks user input for second number
+second_num_check(second_num)
+
+case operation
+when "\/","divide","DIVIDE","Divide","Div","DIV","div"
+  while second_num == "0"
+    print "You are trying to divide by zero please enter another number."
+    second_num = gets.chomp
+    second_num_check(second_num)
+  end
+
+end
+
+# does the calculation of the user input
+case operation
+when "\+","add","addition","Add","ADD","ADDITION","Addition"
+  puts add(first_num, second_num)
+when "\-","subtract","Subtract","sub","Sub","SUB","SUBTRACT"
+  puts subtract(first_num, second_num)
+when "\*","mult","multiply","Multiply","MULTIPLY"
+  puts multiply(num_one, num_two)
+when "\/","divide","DIVIDE","Divide","Div","DIV","div"
+  puts divide(first_num, second_num)
+else
+  print "The calculator does not recognize your input. Please put in an appropriate operator."
+# Need to give the option to try again
+end