Lab 1

Intro to Python

Instructions: https://inst.eecs.berkeley.edu/~cs61a/su19/lab/lab01/

Solution: https://github.com/tomthestrom/cs61a/blob/master/lab/lab01/lab01.py

The first 2 questions are non-coding - WWPD (What Would Python Display?)

Q3: Fix the Bug

def both_positive(x, y):
    """Returns True if both x and y are positive.

    >>> both_positive(-1, 1)
    False
    >>> both_positive(1, 1)
    True
    """
    return x and y > 0 # You can replace this line!

Q3: Solution

def both_positive(x, y): """Returns True if both x and y are positive.
    >>> both_positive(-1, 1)
    False
    >>> both_positive(1, 1)
    True
    """
    return x > 0 and y > 0 # You can replace this line!

Q4: Sum Digits

def sum_digits(n):
    """Sum all the digits of n.

    >>> sum_digits(10) # 1 + 0 = 1
    1
    >>> sum_digits(4224) # 4 + 2 + 2 + 4 = 12
    12
    >>> sum_digits(1234567890)
    45
    >>> x = sum_digits(123) # make sure that you are using return rather than print
    >>> x
    6
    """
    "*** YOUR CODE HERE ***"

Q4: Solution

def sum_digits(n):
    """Sum all the digits of n.
    >>> sum_digits(10) # 1 + 0 = 1
    1
    >>> sum_digits(4224) # 4 + 2 + 2 + 4 = 12
    12
    >>> sum_digits(1234567890)
    45
    >>> x = sum_digits(123) # make sure that you are using return rather than print
    >>> x
    6
    """
    "*** YOUR CODE HERE ***"
    if n < 10:
        return n
    last_digit = n % 10
    return last_digit + sum_digits(n // 10)