Calculator that allows basic maths operations, visit the project by clicking here. :one: ➕ :one:
Basic Calculator
- User Story #1: My calculator should contain a clickable element containing an
=(equal sign) with a correspondingid="equals". - User Story #2: My calculator should contain 10 clickable elements containing one number each from 0-9, with the following corresponding IDs:
id="zero",id="one",id="two",id="three",id="four",id="five",id="six",id="seven",id="eight", andid="nine". - User Story #3: My calculator should contain 4 clickable elements each containing one of the 4 primary mathematical operators with the following corresponding IDs:
id="add",id="subtract",id="multiply",id="divide". - User Story #4: My calculator should contain a clickable element containing a . (decimal point) symbol with a corresponding
id="decimal". - User Story #5: My calculator should contain a clickable element with an
id="clear". - User Story #6: My calculator should contain an element to display values with a corresponding
id="display". - User Story #7: At any time, pressing the clear button clears the input and output values, and returns the calculator to its initialized state; 0 should be shown in the element with the id of display.
- User Story #8: As I input numbers, I should be able to see my input in the element with the id of display.
- User Story #9: In any order, I should be able to add, subtract, multiply and divide a chain of numbers of any length, and when I hit =, the correct result should be shown in the element with the id of display.
- User Story #10: When inputting numbers, my calculator should not allow a number to begin with multiple zeros.
- User Story #11: When the decimal element is clicked, a . should append to the currently displayed value; two . in one number should not be accepted.
- User Story #12: I should be able to perform any operation (+, -, *, /) on numbers containing decimal points.
- User Story #13: If 2 or more operators are entered consecutively, the operation performed should be the last operator entered.
- User Story #14: Pressing an operator immediately following = should start a new calculation that operates on the result of the previous evaluation.
- User Story #15: My calculator should have several decimal places of precision when it comes to rounding (note that there is no exact standard, but you should be able to handle calculations like 2 / 7 with reasonable precision to at least 4 decimal places).
Copyright © 2020, Davi Guimarães.