GRE Subject Tests

Computer Science explores the principles and applications of computing, programming, and information technology.

What is Computing?Programming BasicsInformation Technology in Daily Life
Algorithms and Problem-SolvingData StructuresCybersecurity and Privacy
Building Your First ProgramCollaborative Projects and TeamworkSolving Real-World Problems With Code
Breaking Problems Into StepsPracticing With Mini-Projects
What is Computing?Programming BasicsInformation Technolo...Algorithms and Probl...Data StructuresCybersecurity and Pr...Building Your First ...Collaborative Projec...Solving Real-World P...Breaking Problems In...Practicing With Mini...
Basic Concepts

Programming Basics

Programming: Telling Computers What to Do

Programming is writing instructions that a computer can understand and follow. These instructions are called code, and the language you write them in is a programming language.

Why Do We Program?

Computers are fast but not smart—they need precise directions! Programming lets us automate tasks, build apps, and create games.

Common Programming Languages

  • Python: Great for beginners and widely used in science.
  • JavaScript: Powers websites and interactive web pages.
  • Scratch: Uses blocks to teach programming in a fun way.

Simple Code Example

print("Hello, world!")

This tells the computer to display the words "Hello, world!" on the screen.

Real-World Uses

Programming makes everything from video games to banking apps work smoothly.

Examples

  • Creating a quiz app using Scratch blocks.

  • Writing code to draw a smiley face using Python.

In a Nutshell

Programming is the art of writing instructions for computers to follow.

Key Terms

Programming Language
A special language used to write instructions for computers.
Code
The set of instructions written in a programming language.
Algorithm
A step-by-step solution to a problem, written so a computer can follow it.
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Information Technology in Daily Life