Calculator

Calculator.md

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+# Brittany Jones
+# Ada Calculator
+# Last Edited 2/7/18
+# The program should ask the user for an operation (string or numeric symbol) and two numbers.
+
+#Primary Requirements
+#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.
+
+
+# Prompt user.
+puts "Let us do math!"
+
+# Get first number from user.
+puts "\nEnter the the first number:"
+a = gets.chomp
+while true
+    if a.to_f.to_s == a || a.to_i.to_s == a
+        break
+    else
+        print "Please enter a valid number:"
+        a = gets.chomp
+    end
+end
+
+# Get the operation they want to use.
+puts "Now enter your favorite operator:"
+op = gets.chomp
+
+# Get another number from the user.
+puts "Give me another number:"
+b = gets.chomp
+while true
+    if b.to_f.to_s == b || b.to_i.to_s == b
+        break
+    else
+        print "Please enter a valid number:"
+        b = gets.chomp
+    end
+end
+# While loop, if input goes from integer to string and it is still == to c, then it is a number.
+# To validate if user inputs are valid numbers? (Not sure if this part is needed anymore.)
+def valid_num(num)
+  num == "0" || num.to_i != 0
+end
+
+def dec_num(num)
+  num.include?(".")
+end
+##### NOT SURE IF THIS SECTION IS NEEDED AT ALL, ESPECIALLY IF I HAVE CONVERTED THE USER INPUT INTO FLOAT/Integer.#####
+# change data types of number to float to account for decimal numbers.
+def num_class(i)
+  if dec_num (i)
+    i.to_f
+  else
+    i.to_i
+  end
+end
+####### End of some unworthy code ######
+
+def domath(a, op, b)
+  if valid_num(a) && valid_num(b)
+    a = num_class(a)
+    b = num_class(b)
+#### End of unworthy code which depend upon the previously written uworthy code####
+# Case Loop
+ans_wer = case op
+    when '+' , 'add'
+      a + b
+    when '-' , 'subtract'
+      a - b
+    when ' * ' , 'multiply'
+      a * b
+    when '/', 'divide'
+# What to do when user tries to use division by 0
+      if b != 0
+        a / b
+      else puts "Please enter a number other than '0' when using division"
+      end
+#Add support for the modulo operator (10 % 3 = 1).
+    when '%' , 'modulo'
+      a % b
+#Add support for computing exponents (2^4 = 2 * 2 * 2 * 2 = 16)
+    when ' ** ' , 'exponents'
+      a ** b
+    else
+# If they enter some kind of operator that isnt supported.
+      puts "Sorry, this calculator only does calculations with +, -, %, /, * , and exponents. Please enter your favorite operator:"
+      op = gets.chomp
+    end
+# print it out when def method domath
+  puts "\nLet there be math!"
+  puts "#{a} #{op} #{b} = #{ans_wer}"
+  end
+end
+
+#Print out the formula in addition to the result, i.e. 2 + 2 = 4
+domath(a, op ,b)