November 13, 2019 at 2:18 pm #34887ModeratorMember
Mainly the functions that we need to work for calculator are handling the keypresses, inputting the digits, inputting the decimal point/key, handling operators, resisting the calculators, updating the display, equal key and clear key.
As we know calculator consists of keys and display. So, in the UI perspective we have to work on:
calculator tile – where we show the title
input buttons – where we display all keys
output screen – This is the screen where we can check what input we are entering and showing all the values that we entered.
Before starting this Project you must have knowledge or idea of these things:
some operators like && and ||
change the text with the value attribute
add event listeners
string methods like includes, contains etc.
So, coding part begins here for the first case. Initially, we have to make a div container in which we are going to add all buttons with proper styling. To make this UI we use CSS Grid box which is the best practice of writing proper responsive code. After this, we start work on functionalities.
Firstly we have to initialise the value of each variable and constant. Then we check what key is pressed by the user like operators, operands, decimal or clear according to this key we store it in different variables that we declared. So, when the user hits number keys then we store these values in operands. We define the separate function for each operation like inputting the digit, updating the display, decimal enter etc.
You can check the whole code below.
< !DOCTYPE html>
Here we used the table tag to make UI and for adding additional functions we use form HTML element. On each keypress, we put on click method to add that value to the output screen. And after this eval function evaluate all values when you click on any operator.
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