$2\mathrm{.}1$ Programming $($general$)$

Computer program basics

Computer programs are abundant in many people's ives today, cartying out amplications on simatiphones, lablets, and laptops, powering busiveses the Amazon and Neinix heiping cars dive and plines fly, and much more.

A compute program consists of instructions executing one at a lime$.$ Basio instruotion types are

Input A proyram receives data from a file, kuyboard, touchscreen, network, elo.

Process A program performs computations on that data, such as adding two values like $x+y$

Output A program puis that data somewhere, such as a file, screen, or network

Proyrams use variables to reler la data, like $x,$ y and $z$ below. The name is due to a variable's value 'varying" as a program assigns a variable ike $x$ with new values.