Ampers: Nicoleta Brandolini

calculator.rb

@@ -0,0 +1,90 @@
+# Define the methods
+
+def add(num1, num2)
+  (num1 + num2)
+end
+
+def subtract(num1, num2)
+  (num1 - num2)
+end
+
+def divide(num1, num2)
+  if num2 == 0
+    'No division by zero!'
+  else
+    (num1 / num2)
+  end
+end
+
+def multiply(num1, num2)
+  (num1 * num2)
+end
+
+def modulo(num1, num2)
+  (num1 % num2)
+end
+
+def exponents(num1, num2)
+  (num1**num2)
+end
+
+# Create an array with all operators
+
+operators = ['add', '+', 'subtract', '-', 'multiply', '*',
+             'divide', '/', 'exponent', '^', 'modulo', '%']
+
+# Welcome user message
+
+puts 'Welcome to my Calculator!'
+print "\nWhat operation would you like to perform? "
+operator = gets.chomp
+until operators.include?(operator)
+  puts "That's not an available operator "
+  print 'Please enter an operator: '
+  operator = gets.chomp
+end
+
+print "\nPlease enter the first number: "
+num1 = gets.chomp
+print 'Please enter the second number: '
+num2 = gets.chomp
+
+# Checking for user input to be a number
+
+until (num1.to_i.to_s == num1.to_s) && (num2.to_i.to_s == num2.to_s)
+  puts "That's not an acceptable number!"
+  print 'Please enter a number: '
+  num1 = gets.chomp
+  print "\nPlease enter another number: "
+  num2 = gets.chomp
+end
+
+# Convert to a float
+num1 = num1.to_f
+num2 = num2.to_f
+
+# Calculate
+case operator
+when 'add', '+'
+  result = add(num1, num2)
+  operator = '+'
+when 'subtract', '-'
+  result = subtract(num1, num2)
+  operator = '-'
+when 'multiply', '*'
+  result = multiply(num1, num2)
+  operator = '*'
+when 'divide', '/'
+  result = divide(num1, num2)
+  operator = '/'
+when 'exponent', '^'
+  result = exponents(num1, num2)
+  operator = '**'
+when 'modulo', '%'
+  result = modulo(num1, num2)
+  operator = '%'
+end
+
+# Output
+
+puts "\n#{num1} #{operator} #{num2} = #{result}\n"