Exercise 02-02:
Type the following expression in the interpreter:
10 % 3 * 10 ** 2 + 1 - 10 * 4 / 2
Try to solve the same calculation using only pencil and paper. Notice how important the priority of operations is.
Answer:
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# Python From Scratch
# Author: Nilo Ney Coutinho Menezes
# Editora Novatec (c) 2010-2025 - LogiKraft 2025
# Site: https://pythonfromscratch.com
# ISBN: 978-85-7522-949-1 (Paperback), 978-85-7522-950-7 (hardcover), 978-85-7522-951-4 (ebook)
#
# File: chapter 02/exercise-02-02.py.py
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# The result of the expression:
# 10 % 3 * 10 ** 2 + 1 - 10 * 4 / 2
# is 81.0
#
# Performing the calculation with the priorities from page 39,
# executing only one operation per line,
# we have the following calculation order:
# 0 --> 10 % 3 * 10 ** 2 + 1 - 10 * 4 / 2
# 1 --> 10 % 3 * 100 + 1 - 10 * 4 / 2
# 2 --> 1 * 100 + 1 - 10 * 4 / 2
# 3 --> 100 + 1 - 10 * 4 / 2
# 4 --> 100 + 1 - 40 / 2
# 5 --> 100 + 1 - 20
# 6 --> 101 - 20
# 7 --> 81
#
# If you're curious to know why the result
# is 81.0 and not 81, read section 3.2, page 45.
# The division operation always results in a floating point number.