lab1's Introduction

Android Integer Calculator

Requirements:

The calculator should have a basic UI that essentially complies with the attached wire frame. You can change the layout if you prefer.
Number Pad: 0-9
It needs to support operations and commands: +, - ,*, /, Clear, =
A display for displaying the numbers (each number is up to 7 digits, not counting the - for negative numbers.)
No need to display operand on the display, only one number should be displayed at any given time
When the user enters 14 + 7 =, it should display 14, then 7, and finally the result 21
Leading zeros should be discarded
When the user enters 0 0 4, you show 0 first, then still 0, and finally just 4, but not 004 or 04. This is true for calculation results as well.
It needs to be able to handle multiple operations in a sequence Example: 5+9-3+10
It should ONLY use the last operand if multiple operands are entered consecutively Example: “5++-1=” is equivalent to “5-1=”
Proper error handling and self correction.
“+-5” is equivalent to negative 5
“*/+-5” is equivalent to negative 5
0004 + 32 ++ 0101 - - 04= is equivalent to 4+32+101-4=
39 + 48 = - 10 + 5 - 98= is equivalent to 39+48-10+5-98=
Display should show 39, 48, 87, 10, 77,5, 82,98, -16
Integer operations only
Always rounding to the closest integer; when ambiguity occurs, rounding away from 0; e.g. 2 / 5 = 0 8 / 9 = 1 -7 / 6 = -1 5 / 2 = 3 -5 / 2 = -3
If divided by zero, or missing operand, e.g., 5=, or 5=, show the error message ERROR!
Overflow handling: if the result is bigger than 9999999 or smaller than -9999999, show OVERFLOW! If any number of those ranges are typed in, show the same error message instantly as well.

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