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Understanding how programming works

From: Programming for Non-Programmers: iOS 7

Video: Understanding how programming works

So, how does programming work? In programming, there are three steps. Writing code involves creating computer commands in a human readable language. While there are a lot of code specific things So using a human readable language, we're able to write commands for a computer.

Understanding how programming works

So, how does programming work? In programming, there are three steps. Writing the code, compiling the code, and running the code. Writing code involves creating computer commands in a human readable language. While there are a lot of code specific things in here, like braces, and semi colons and equal signs. You'll also notice a lot of English words. Void, view did load, super, value string and mode.

So using a human readable language, we're able to write commands for a computer. The next step is to compile the code. In Xcode, compiling is called building. Building translates your human-readable code into a language that a computer can understand. In addition, compiling creates an app file known as an executable. If this process sounds complicated, rest assured knowing that all you have to do is click a button for this to happen. In compiling the code, you could also designate some lines to be ignored.

These lines are called comments, and comments are prefaced with two forward slashes. You can use comments to temporarily enable or disable a line of code, or to write notes to yourself or other developers you may be working with. Finally, you run the code. When you run the code, the compiled app or executable file is opened up and launched. Code runs sequentially, usually immediately. What that means is that your code runs from top to bottom, in order.

And if there's no visible space in between one line of code running and another line of code running. So usually all the commands are executed, and then the visual interface is updated. And just like building the code this is all done automatically with the press of a button. When we press the Run button in X code, all of these things happen at once. The code was translated into a machine readable language, or built and then ran in a ios simulator.

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This video is part of

Image for Programming for Non-Programmers: iOS 7
Programming for Non-Programmers: iOS 7

42 video lessons · 9444 viewers

Todd Perkins
Author

 
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  1. 5m 18s
    1. Welcome
      44s
    2. What you should know before starting this course
      1m 17s
    3. Related courses
      1m 8s
    4. Using the exercise files
      1m 19s
    5. Viewing the finished app
      50s
  2. 10m 24s
    1. Finding and installing Xcode
      35s
    2. Creating an Xcode project
      1m 55s
    3. Understanding the Xcode interface
      3m 54s
    4. Configuring Xcode for app development
      2m 14s
    5. Configuring the iOS Simulator for app development
      1m 46s
  3. 43m 43s
    1. Understanding how programming works
      2m 34s
    2. Understanding variables
      2m 56s
    3. Using primitive variables
      9m 10s
    4. Using pointer variables
      4m 51s
    5. Using instance variables
      5m 19s
    6. Connecting visual objects to variables
      8m 12s
    7. Placing a number variable in a string
      4m 33s
    8. Challenge: Create two variables
      54s
    9. Solution: Create two variables
      5m 14s
  4. 27m 14s
    1. Understanding functions, methods, and selectors
      4m 43s
    2. Using functions, methods, and selectors
      7m 1s
    3. Understanding parameter functions
      2m 10s
    4. Connecting a button to a function
      7m 47s
    5. Challenge: Create a counter app
      43s
    6. Solution: Create a counter app
      4m 50s
  5. 13m 38s
    1. Understanding conditional statements
      2m 35s
    2. Using conditional statements
      5m 21s
    3. Challenge: Build an on/off button app
      39s
    4. Solution: Build an on/off button app
      5m 3s
  6. 44m 59s
    1. Viewing the app's code structure
      2m 11s
    2. Setting up the user interface
      7m 9s
    3. Setting up variables and functions
      5m 8s
    4. Connecting all of the visual elements to code
      2m 59s
    5. Displaying tapped numbers in the calculator
      4m 47s
    6. Controlling when tapped numbers should not appear in the calculator
      3m 27s
    7. Making the Clear button clear all values
      1m 4s
    8. Setting the calculator to add or subtract
      4m 29s
    9. Showing the total when the equals button is tapped
      3m 40s
    10. Formatting a number with commas
      5m 25s
    11. Challenge: Add a multiplication button
      1m 5s
    12. Solution: Add a multiplication button
      3m 35s
  7. 24s
    1. Next steps
      24s

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