Guille-- Carets

method_calculator.rb

@@ -0,0 +1,128 @@
+# Method to check if a string is numeric
+def is_num(number)
+  if number.to_s == number.to_f.to_s
+    return true
+  elsif number.to_s == number.to_i.to_s
+    return true
+  else
+    return false
+  end
+end
+
+# Method that returns calculator operations
+# If argument attempts to divide zero it returns "Cannot divide by zero"
+# If argument attempt to perform operation other than +,-,*,/,%,^ it returns "Operator is not supported"
+def calculator(num1,operator,num2)
+  case operator
+  when "add", "+", "plus"
+    return num1 + num2
+  when "subtract", "-", "minus"
+    return num1 - num2
+  when "multiply", "*", "times"
+    return num1 * num2
+  when "power", "^"
+    return num1**num2
+  when "%", "modulo"
+    return num1 % num2
+  when "divide", "/"
+    if num2 == 0
+      return "Cannot divide by zero"
+    else
+    return num1 / num2
+    end
+  else
+    return "Operator is not currently supported"
+  end
+end
+
+# Method that turns operations into appropriate math symbol
+def equation(num1,operator,num2)
+  case operator
+  when "add", "+", "plus"
+    return "#{num1} + #{num2}"
+  when "subtract", "-", "minus"
+    return "#{num1} - #{num2}"
+  when "multiply", "*", "times"
+    return "#{num1} * #{num2}"
+  when "power", "^"
+    return "#{num1} ^ #{num2}"
+  when "%", "modulo"
+    return "#{num1} % #{num2}"
+  when "divide", "/"
+    return "#{num1} / #{num2}"
+  else
+    return "#{num1} #{operator} #{num2}"
+  end
+end
+
+
+
+# Prompts user to enter a number, operation and another number
+puts " I take in arguments as number operator number. "
+input = gets.chomp
+
+# Splits input into array named calculation
+calculation = input.split
+
+# If user inputs more than 3 things, they will be prompted to re-enter input
+# If user does not enter numbers, they will be prompted to re-enter inputs
+i = 0
+while i <= 1
+  if [-1, 1].include? calculation.length <=> 3
+    puts "Please only enter 3 things! Number Operator Number"
+    input = gets.chomp
+    calculation = input.split
+  elsif (is_num(calculation[0]) != true) || (is_num(calculation[2]) != true)
+    puts "\nI can only calculate numbers!  Make sure you put in number operation number."
+    input = gets.chomp
+    calculation = input.split
+  else
+    i += 1
+  end
+end
+
+# Converts the first and last elements of user's input to floats and assigns them to variables
+num1 = calculation[0].to_f
+num2 = calculation[2].to_f
+
+# Assigns the second element of user's input to operator variable
+operator = calculation[1]
+
+# Invokes calculator method with numbers and operator
+result = calculator(num1, operator, num2)
+
+# If the result ends with a .0, the result is displayed as an integer
+if "#{result}".slice(-2..-1) == ".0"
+  result = "#{result}".slice(0..-3)
+else
+end
+
+# Invoked equation method to convert operator into appropriate mathematical symbol
+# If operation is not supported by calculator, it will not change the operator
+eq = equation("#{calculation[0]}", "#{calculation[1]}", "#{calculation[2]}" )
+
+if "#{eq} = #{result}".length > 15
+  short_result = "#{result}".slice(0..5) + "..."
+  screen = "#{eq} = #{short_result}"
+else
+  screen = "#{eq} = #{result}"
+end
+
+# Prints results to calculator screen
+puts " _____________________"
+puts "|  _________________  |"
+puts "  RESULT..."
+puts ""
+puts "    #{screen}     "
+puts ""
+puts "|  _________________  |"
+puts "|  ___ ___ ___   ___  |"
+puts "| | 7 | 8 | 9 | | + | |"
+puts "| |___|___|___| |___| |"
+puts "| | 4 | 5 | 6 | | - | |"
+puts "| |___|___|___| |___| |"
+puts "| | 1 | 2 | 3 | | x | |"
+puts "| |___|___|___| |___| |"
+puts "| | . | 0 | = | | / | |"
+puts "| |___|___|___| |___| |"
+puts "|_____________________|"