calculator

calculator.rb

@@ -0,0 +1,75 @@
+
+# Program for calculator.
+puts " Welcome to the calculator "
+operators_array = %w[add + subtract - divide / multiply * % ^]
+puts operators_array
+
+# To verify whether the user enteres a valid operator
+puts "Which operation would you like to perform "
+operation = gets.chomp
+while !operators_array.include?(operation)
+  print "Invalid input,Please try again\n"
+  operation = gets.chomp
+end
+
+# To know when it needs to return an _integer_ versus a _float_.
+def convert_i_f(value)
+  if (value =~ /\./)
+    value = value.to_f
+  elsif
+    value = value.to_i
+  end
+  return value
+end
+
+# To check whether the user input is numeric for first number
+flag = true
+while flag
+  puts "Enter the first number "
+  num1 = gets.chomp
+  if (num1 =~ /[a-zA-Z]/)
+    print "Invalid input; Please input again\n"
+  else
+    flag = false
+  end
+end
+f_num = convert_i_f(num1)
+
+# To check whether the user input is numeric for second number
+flag = true
+flag = true
+while flag
+  puts "Enter the second number "
+  num2 = gets.chomp
+  if (num2 =~ /[a-zA-Z]/)
+    print "Invalid input; Please input again\n"
+  else
+    flag = false
+  end
+end
+
+s_num = convert_i_f(num2)
+
+# To handle division by zero
+while (s_num == 0 ) && (operation == "division" || operation == "/")
+  puts " Can't divide by Zero,Enter the input again "
+  num2 = gets.chomp
+  s_num = convert_i_f(num2)
+end
+
+# To perform the operations
+
+if operation == "add" || operation == "+"
+  result = f_num + s_num
+elsif operation == "subtract" || operation == "-"
+  result = f_num - s_num
+elsif operation == "multiply" || operation == "*"
+  result = f_num * s_num
+elsif operation == "division" ||operation == "/"
+  result = f_num/s_num
+elsif operation == "modulo" || operation == "%"
+  result = f_num % s_num
+elsif operation == "^"
+  result = f_num**s_num
+end
+puts "#{num1} #{operation} #{num2} = #{result}"