An Intro to Python 3/

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Puzzles 15 to 18

Puzzles 15 to 18

Examine branching, negative indices, for loop, and functions in Python.

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Puzzle 15

What is the output of the following code?

Note: Enter the output you guessed. Then, press the Run button, and your new Elo will be calculated. Don’t forget to save your Elo rating.

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Elo
1000
#############################
## id 148
## Puzzle Elo 845
## Correctly solved 36 %
#############################
def if_confusion(
      x, y):
  if x > y:
    if x - 5 > 0: 
      x=y
      return "A" if y == y + y else "B"
    elif x + y > 0:
      while x > y: x -= 1
      while y > x: y -= 1
      if x == y:
        return "E"
  else:
    if x - 2 > y - 4:
      x_old = x
      x=y*y
      y = 2 * x_old
      
      if (x - 4) ** 2 > (y - 7) ** 2:
        return "C"
      return "D"
    return "H"
print(if_confusion(3, 7))

Enter the input below

Branching

Just like any other programming language, Python also has Conditional Statements also known as Branching Statements. To create branches, you can use the keywords if, else, or elif.

The computer does not execute the code strictly from top to bottom, and you shouldn’t as well.

Instead, start where the program execution starts, which is at the bottom with the function call if_confusion(3, 7).

Now you know that x=3 and y=7. Then, you proceed to do what the interpreter does.

As x>y is false, you can skip the whole upper part of the function. Similarly, you can skip the if branch for x-2>y-4. It’s easy to see that the function returns 'H'.


Solution

The correct solution is H.

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