Gaia/Calculator

From MozillaWiki
Jump to: navigation, search

Design Specs

Interaction

Visual

Requirements

General

  • I can see the equation I've entered
  • I can see the results of the current calculation

Basic Operations & Calculator functions

  • I can enter in a number with a maximum of N digits
  • I can change the sign of a number
  • I can enter in a decimal number
  • I can add two numbers together
  • I can subtract one number from the other
  • I can multiply two numbers together
  • I can divide a non-zero number from another number
  • I can clear an equation from the screen
  • I can clear the last digit of a number I just entered, as long as I haven't pressed an operator key yet

Extended Calculator functions (Might not need or want these features for v1)

  • I can perform an operation a second time by pressing the equals sign a second time.
  • I can convert the result from a percentage to a decimal value.
  • I can store a result in the calculator's memory
  • I can retrieve a result from the calculator's memory
  • I can clear the value in the calculator's memory
  • log/ln/e
  • ^
  • squareroot and root
  • Pi/tau
  • cos/sin/tan

Computation Cases

  • I'm informed that I can't divide a number by zero (cannot divide by zero)
  • I'm informed that I can't divide zero by zero (result is undefined)
  • I can view the result in exponential notation if the number is too large or too small to be displayed