Numeric keypad: Popular with accountants, bank tellers, and airline ticket agents, the numeric keypad contains calculator-like keys. So why was this accepted layout changed for the touch-tone phone and everything involving number keypads ever since Here are some theories Theory 1: The calculator keyboard was widely accepted by the time the touch-tone phone came about in the 1950s.
#CALCULATOR KEYPAD LAYOUT CODE#
Comments are added inside the code to understand the code in more detail. Above them are more cursor-control keys the six-pack of Insert, Delete, Home, End, Page Up, and Page Down. So that’s why 1, 2, 3 are at the bottom and 7, 8, 9 are at the top. Below is the code for the MainActivity.java file. To display stored in sum we have to use setText() as follows: tText(final_sum.toString())įinal_sum stores the sum and it’s necessary to convert it to string(.toString()). store the added value in another variable. Now store the number in int form and apply addition. We have to do the same with another Textbox(e2). Here s11 stores the number entered in textbox 1. Here we have used TextView because we only have to display text avoiding it being user-changeable. Now we have to input numbers in form of string using the getText() function. The input statement will be "String s11=e1.getText().toString() " Here num1 is id for the textbox and we are just giving a variable name ‘e1’ to text box with id ‘num1’. Similarly, we have to use the same statement for the second textbox with the variable name ‘e2’. For the third text box, we have used "TextView t1=(TextView) findViewById(R.id.result) " Open the MainActivity.java file there within the class, and make a method named doSum(View v). In this method, first of all, we have to link two EditText with variables so that we can use them for our input. So link those edit box with variables we have written "EditText e1=(EditText )findViewById(R.id.num1) " Step 3: Working with the MainActivity.java file Split() String method in Java with examplesĪfter using this code the UI will be like as follows:.Producer-Consumer solution using threads in Java.
#CALCULATOR KEYPAD LAYOUT HOW TO#
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