Gaia/Calculator

Design Specs

Interaction

• Dropbox

Visual

• Dropbox
• Box

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