How Code Becomes a Running Program
From the words you type to a game that really runs
Big Idea: You write code in words that people can read. But a computer only understands its own secret language of 1s and 0s. A special helper called a translator turns your words into that secret language, and then your program can run!
By the end you will be able to:
- explain the path from source code to a running program,
- say what a translator does and why it is needed,
- tell the difference between compiled languages (like C++) and interpreted languages (like Python and JavaScript).
1. Source code: the words you write
When a programmer makes a program, they type instructions in a programming language such as Python, C++, or JavaScript. This text that a person writes and can read is called source code.
Source code looks a bit like short, tidy English. For example, one line might say print("Hello!"). That is easy for a person to read — but a computer cannot follow it directly yet.
2. Machine code: the computer's own language
Deep inside, a computer only understands machine code — long strings of 1s and 0s like 01001000 01101001. That is the only language it can run directly.
People find it very hard to read 1s and 0s, and computers cannot read our words. So we have a problem: how do the words you type become something the computer can actually do?