Question

Hand trace the following:

y =0

for x in range(5):

y = y+x

print(" x =", x, " and y =" ,y)

Note: You can shorten the prompts in your hand trace if you want to.

You can write this on paper or in a text editor or whatever you like. I think Excel makes it easy, but note that I just use Excel as a way to put items in rows and columns -- there aren't any Excel features that will automatically calculate these for you.

Be sure to be careful when doing it; details matter!

Answer 1

The hand-traced output for the given code is as follows:

x = 0 and y = 0

x = 1 and y = 1

x = 2 and y = 3

x = 3 and y = 6

x = 4 and y = 10

Step-by-step explanation:

In the given Python code, a loop iterates over the range from 0 to 4 (5 exclusive). Within each iteration, the value of `y` is updated by adding the current value of `x`. The initial value of `y` is 0.

1. For the first iteration (x = 0), y remains 0.

2. In the second iteration (x = 1), y is updated to 0 + 1 = 1.

3. In the third iteration (x = 2), y is updated to 1 + 2 = 3.

4. In the fourth iteration (x = 3), y is updated to 3 + 3 = 6.

5. In the fifth and final iteration (x = 4), y is updated to 6 + 4 = 10.

The print statements within the loop display the values of `x` and the updated value of `y` in each iteration.

Understanding how loops and variables interact in programming can enhance your problem-solving skills. Explore more about Python loops and variable manipulation to deepen your understanding of code execution.