Selam's Calculator assignment

Selamawit-Ainalem-Amperes-Calculator.rb

@@ -0,0 +1,196 @@
+@MAX_AMOUNT_OF_ATTEMPTS = 2
+
+def collect_user_info()
+  operations = { 'add' => '+',
+                'subtract' => '-',
+                'divide' => '/',
+                'multiply' => '*',
+                'exponent' => '^',
+                'modulo'  => '%'
+                }
+
+  puts "\nHello! Welcome to Ada calculator!"
+  puts "Enter two numbers you'd like to calculate.\n\n"
+
+  print "Number 1: "
+  num1 = gets.chomp
+  num1 = confirm_integer(num1)
+
+  print "Number 2: "
+  num2 = gets.chomp
+  num2 = confirm_integer(num2)
+
+  print "Enter an operation(+,-,/,*,%,^): "
+  user_operation = gets.chomp
+  count = 0
+
+  while operations[user_operation] == nil && operations.invert[user_operation] == nil
+    if count > @MAX_AMOUNT_OF_ATTEMPTS
+      puts "Maximum amount of attempts have been exceeded. Default -add- operation has been selected."
+      user_operation = 'add'
+      break
+      #is there a better way to write these loops to exit without a break?
+    end
+    puts "Sorry, not a valid entry, try again."
+    print "Operation: "
+    user_operation = gets.chomp
+    count+=1
+  end
+
+  if user_operation == 'add' || user_operation == '+'
+    puts add(num1,num2)
+  elsif user_operation == 'subtract' || user_operation == '-'
+    puts subtract(num1,num2)
+  elsif user_operation == 'divide' || user_operation == '/'
+    puts divide(num1,num2)
+  elsif user_operation == 'multiply' || user_operation == '*'
+   puts multiply(num1,num2)
+ elsif user_operation == 'exponent' || user_operation == '^'
+   puts exponents(num1,num2)
+ elsif user_operation == 'modulo' || user_operation == '%'
+   puts modulo(num1,num2)
+  end
+end
+
+def confirm_integer(a_number)
+  number_attempts = 0
+  while a_number.to_f.to_s != a_number && a_number.to_i.to_s != a_number
+    puts "You have #{@MAX_AMOUNT_OF_ATTEMPTS-number_attempts+1} number of attempts, please re-enter a number"
+    print "New number: "
+    a_number = gets.chomp
+    if number_attempts > @MAX_AMOUNT_OF_ATTEMPTS
+      puts "You have exceeded the allowed number of attempts, the default number 5 has been selected."
+      a_number = 5
+      break
+    end
+    number_attempts +=1
+  end
+  return a_number.to_f
+end
+
+def add(num1,num2)
+  return "#{num1} + #{num2} = #{num1+num2.round(2)}"
+end
+
+def subtract(num1,num2)
+  puts "\nEnter A for: #{num1}-#{num2}"
+  print "Enter B for: #{num2}-#{num1}\n"
+  print "Selection: "
+  subtract_choice = gets.chomp.upcase
+  count = 0
+  while subtract_choice != 'A' && subtract_choice !='B'
+    if count > @MAX_AMOUNT_OF_ATTEMPTS
+      puts "You have exceeded maximum amount of entries. Default selection (A) has been made."
+      subtract_choice = 'A'
+      break
+    end
+    puts "You have #{(@MAX_AMOUNT_OF_ATTEMPTS - count)+1} attempts please re-enter a valid menu option.}"
+    print "Menu option: "
+    subtract_choice = gets.chomp
+    count+=1
+  end
+  if subtract_choice == 'A'
+    subtract_value = "#{num1} - #{num2} = #{num1 - num2}"
+  else
+    subtract_value = "#{num2} - #{num1} = #{num2 - num1}"
+  end
+  return subtract_value
+end
+
+def multiply(num1,num2)
+  return "#{num1} * #{num2} = #{num1*num2.round(2)}"
+end
+
+def divide(num1,num2)
+  puts "\nEnter A for: #{num1}/#{num2}"
+  puts "Enter B for: #{num2}/#{num1}\n"
+  print "Selection: "
+  divide_choice = gets.chomp.upcase
+  count = 0
+  while divide_choice != 'A' && divide_choice !='B'
+    if count > @MAX_AMOUNT_OF_ATTEMPTS
+      puts "You have exceeded maximum amount of attempts. Default value (A) has been selected."
+      divide_choice = 'A'
+      break
+    end
+    puts "You have #{@MAX_AMOUNT_OF_ATTEMPTS-count+1} attempts remaining please enter a valid menu option."
+    print "Menu choice: "
+    divide_choice = gets.chomp.upcase
+    count+=1
+  end
+  if divide_choice == 'A'
+    while num2 == 0
+      puts "Can't divide by 0, try again"
+      print "Re-enter number 2: "
+      num2 = gets.chomp
+      num2 = confirm_integer(num2)
+    end
+    divide_value = "#{num1}/#{num2} = #{(num1/num2).round(2)}"
+  else
+    while num1 == 0
+      puts "Can't divide by 0, try again"
+      print "Re-enter number 1: "
+      num1 = gets.chomp
+      num1 = confirm_integer(num1)
+    end
+    divide_value = "#{num1}/#{num2} = #{(num2/num1).round(2)}"
+  end
+  return divide_value
+end
+
+def exponents(num1, num2)
+  puts "\nEnter A for: #{num1} base case"
+  puts "Enter B for: #{num2} base case\n"
+  print "Selection: "
+  exponent_choice = gets.chomp.upcase
+  count = 0
+  while exponent_choice != 'A' && exponent_choice !='B'
+    if count > @MAX_AMOUNT_OF_ATTEMPTS
+      puts "You have exceeded the maximum number of attempts. Default choice (A) is selected."
+      exponent_choice = 'A'
+    end
+    print "Enter a valid menu option"
+    exponent_choice = gets.chomp.upcase
+    count+=1
+  end
+  if exponent_choice == 'A'
+    exponent_value = "#{num1}^#{num2} = #{num1}"
+    (num2.to_i-1).times do
+      exponent_value.concat(" * #{num1}")
+    end
+     exponent_value.concat(" = #{num1**num2}")
+  else
+    exponent_value = "#{num2}^#{num1} = #{num2}"
+    (num2.to_i-1).times do
+      exponent_value.concat(" * #{num2}")
+  end
+    exponent_value.concat(" = #{num2**num1}")
+  end
+end
+
+def modulo(num1,num2)
+  puts "\nEnter A for: #{num1} % #{num2}"
+  puts "Enter B for: #{num2}  % #{num1}\n"
+  print "Selection: "
+  modulo_choice = gets.chomp.upcase
+  count = 0
+  while modulo_choice != 'A' && modulo_choice !='B'
+    if count > @MAX_AMOUNT_OF_ATTEMPTS
+      puts "You have exceeded the maximum number of attempts default choice (A) is selected."
+      modulo_choice = 'A'
+      break
+    end
+    puts "You have #{@MAX_AMOUNT_OF_ATTEMPTS-count+1} attempts remaining to enter valid attempts."
+    print "Menu option: "
+    modulo_choice = gets.chomp.upcase
+    count+=1
+  end
+  if modulo_choice == 'A'
+    mod_val = "#{num1} % #{num2} = #{num1%num2}"
+  else
+    mod_val = "#{num2} % #{num1} = #{num2%num1}"
+  end
+    return mod_val
+  end
+
+collect_user_info()