Indie game dev

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  • 245 Posts
  • 36 Comments
Joined 1 year ago
Cake day: August 4th, 2023
  • Mac@programming.devtoProgramming@programming.dev•Why does the for loop repeat in this recursion?
    5·
    11 months ago

    When the draw function calls itself it yields control to that new function its calling. When that function ends it takes back control and continues doing what it was doing.

    This means all of the for loops in all of the functions will execute. Draw(1) will do the for loop and then return as it hits the end of the function (standard behaviour when you reach the end of a function even if theres no return statement). Then draw(2) will do the for loop as it gets back control now that draw(1) is done and then return, etc. all the way up

    All parts of a function are recursive, theres no such thing as a non recursive part

  • Mac@programming.devtoProgramming@programming.dev•Why does the for loop repeat in this recursion?
    8·
    11 months ago

    This code has a recursive call (function calls itself) within the function so that has to be taken into account when tracing it

    This would make the function execute multiple times so the for loop would end up executing multiple times.

    Lets say main calls draw with a height value of 10 (draw(10)). First it sees that n is greater than 0 so it keeps going. Then it calls the draw function with a value of 10 - 1 aka 9. Now its executing in the draw(9) function. Greater than 0 so continues and calls draw(8). etc. all the way down to draw(0) where it sees that n is equal to 0 so returns out of the function due to the return statement.

    Now that draw(0) finished executing draw(1) can keep going and goes to the for loop. Here it prints 1 # and then prints a new line (and then returns since it hit the end of the function). Now that draw(1) is done draw(2) can keep going and prints 2 #'s and then prints a new line (and then returns). This keeps going all the way up to the initial draw call, draw(10) which prints 10 #'s and then a new line, returns, and then the main function keeps going but theres nothing after that so it returns and the execution ends.

    The effect from coming back after the recursive calls makes it seem like n is increasing but its just different calls to the same function. i is taken into account for but printing the amount of #'s since thats whats within that loop