Develop ronald rios frontend

[ronaldris21]

Every case is passes from the Notion cases covered:
You can use your keyboard keys instead of directly clicking.

Cases covered:

• Positive and negative integer arithmetic operations:
  • -1 + -1 = -2
  • -1 + 1 = 0
  • 1 + 1 = 2
  • 1 + -1 = 0
  • -2 * 1 = -2
  • 2 * 1 = 2
  • 2 * -1 = -2
  • 2 * 1 = 2
  • 22 - 5 = 17
  • -22 - 5 = -27
  • 22 / 2 = 11
  • 22 / -2 = -11
  • -22 / 2 = -11``
  • -22 / -2 = 11
• Division and multiplication with no previous operands will assume operand of zero and return zero:
  • *num = 0
  • / num = 0
• Multiple operations will be chained and display updated result upon entering next operator key.
  • 3 + 5 + (8)...
• Incomplete operations will ignore the last operator and display final result. Note: This is also the only possible error handled.
  • 3 + 5 + = 8
• Division by zero will return Error
  • num / 0 = Error