# Homework 1: Functions hw01.zip

Due by 11:59pm on Wednesday, September 11

## Instructions

Download hw01.zip.

Submission: When you are done, submit the assignment by uploading all code files you've edited to Gradescope. You may submit more than once before the deadline; only the final submission will be scored. Check that you have successfully submitted your code on Gradescope. See Lab 0 for more instructions on submitting assignments.

Using Ok: If you have any questions about using Ok, please refer to this guide.

Readings: You might find the following references useful:

Grading: Homework is graded based on correctness. Each incorrect problem will decrease the total score by one point. This homework is out of 2 points.

## Getting Started Videos

These videos may provide some helpful direction for tackling the problems on this assignment.

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YouTube link

# Required Questions

### Q1: A Plus Abs B

Python's `operator` module contains two-argument functions such as `add` and `sub` for Python's built-in arithmetic operators. For example, `add(2, 3)` evalutes to 5, just like the expression `2 + 3`.

Fill in the blanks in the following function for adding `a` to the absolute value of `b`, without calling `abs`. You may not modify any of the provided code other than the two blanks.

``````def a_plus_abs_b(a, b):
"""Return a+abs(b), but without calling abs.

>>> a_plus_abs_b(2, 3)
5
>>> a_plus_abs_b(2, -3)
5
>>> a_plus_abs_b(-1, 4)
3
>>> a_plus_abs_b(-1, -4)
3
"""
if b < 0:
f = _____
else:
f = _____
return f(a, b)``````

Use Ok to test your code:

``python3 ok -q a_plus_abs_b``

Use Ok to run the local syntax checker (which checks that you didn't modify any of the provided code other than the two blanks):

``python3 ok -q a_plus_abs_b_syntax_check``

### Q2: Two of Three

Write a function that takes three positive numbers as arguments and returns the sum of the squares of the two smallest numbers. Use only a single line for the body of the function.

``````def two_of_three(i, j, k):
"""Return m*m + n*n, where m and n are the two smallest members of the
positive numbers i, j, and k.

>>> two_of_three(1, 2, 3)
5
>>> two_of_three(5, 3, 1)
10
>>> two_of_three(10, 2, 8)
68
>>> two_of_three(5, 5, 5)
50
"""
return _____
``````

Hint: Consider using the `max` or `min` function:

``````>>> max(1, 2, 3)
3
>>> min(-1, -2, -3)
-3``````

Use Ok to test your code:

``python3 ok -q two_of_three``

Use Ok to run the local syntax checker (which checks that you used only a single line for the body of the function):

``python3 ok -q two_of_three_syntax_check``

## Check Your Score Locally

You can locally check your score on each question of this assignment by running

``python3 ok --score``

This does NOT submit the assignment! When you are satisfied with your score, submit the assignment to Gradescope to receive credit for it.

# Submit Assignment

Submit this assignment by uploading any files you've edited to the appropriate Gradescope assignment. Lab 00 has detailed instructions.