Question

The problem in the Starting Out with Phython, 4th Edition, textbook solutions for Chpt 7, PE 1 is different than in the textbook.

Here is my program. The exact instructions is in the comments. Here is what I want to know. 1) is this correct? 2) is this the most efficient way to create the output.

#Chapter 7
#Exercise 1

#design a program that uses a loop to build a list named
#valid_numbers that contains only the numbers between
#0 and 100 from the numbers list below. The program
#should then determine and display the total and average
#of the values in the valid_numbers list.

def main():

numbers = [74, 19, 105, 20, -2, 67, 77, 124, -45, 38]

valid_numbers = []
total = 0
average = 0
counter = 0
  
for x in numbers:
if x >= 0 and x <= 100:
valid_numbers.append(x)
total += x
counter += 1

average = total / counter

print('The total is: ', total, ' and the average is: ', average, sep='')

main()

Answer 1

The program seems correct, and it gives true results.

It has a time complexity of O(n), which is significantly good for such a problem.

The output can be optimized by rounding off the digits up to two decimal places.

It is done in the provided code.

#Chapter 7
#Exercise 1

# design a program that uses a loop to build a list named
# valid_numbers that contains only the numbers between
# 0 and 100 from the numbers list below. The program
# should then determine and display the total and average
# of the values in the valid_numbers list.

def main():

  numbers = [74, 19, 105, 20, -2, 67, 77, 124, -45, 38]

  valid_numbers = []
  total = 0
  average = 0
  counter = 0
    
  for x in numbers:
    if x >= 0 and x <= 100:
      valid_numbers.append(x)
      total += x
      counter += 1

  average = round(total/counter,2)

  print('The total is: ', total, ' and the average is: ', average, sep='')

main()