seegongsik
Programming · how to tell a computer what to do
Speaking in code
A computer can't act on its own. Write what to do and in what order, and it does just that. Let's learn how to write it, step by step.
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01What is code, really?
Words that tell a computer what to do, in order. Like a recipe, line by line, top to bottom.
02Where do we store values?
A box that holds a value with a name on it. Keep the box, change the value, stay flexible.
03How do we exchange values?
Output shows on screen, input takes a value in. The two directions an app talks with us.
04Numbers, text, true and false
A value's kind decides what it can do. The text "3" and the number 3 are different.
05If so, then a fork
Pick a path by whether a condition is true or false. The first moment a program decides on its own.
06Calculating with symbols
Symbols that add, subtract, and compare. They make new values or give true and false.
07Doing the same thing many times
Write the same thing once and have it done many times. What a computer does best.
08A Row of Boxes: Arrays
Line things up in a row and grab any one by its spot.
09Bundle it, give it a name
Bundle several things into one chunk and give it a name. Call the name and it all happens.