Question

Write and test a Python program to print a set of real numbers in descending order. The program should also print out the median of the numbers input and how many numbers were input. The program should read in numbers until a negative number is read. The negative number serves as a sentinel or marker telling the program when to stop reading numbers. The program should then sort the numbers and print them out in order from largest to smallest. Note, the sentinel number is not to be considered as one of the numbers, it should not be printed. The program should be able to handle up to 100 input numbers. If the user attempts to enter more than 100 numbers, the program should print an error message and quit.

Also do not use list methods like list.append etc. or import any libraries to solve this problem.

Here is the template to work off of:

# get the numbers and input into the list
def get_numbers(nums):
  # stop when -99.0 is entered

  i = 0;
  while i < 10:
    nums[i] = input("Enter a number: ")
    if nums[i] == -99.0:
      break

    i = i + 1

  return i  # returning the total number of numbers entered

# output all num numbers
def print_numbers(nums, num):

  # output each number one line at a time
  for i in range(num):
    print nums[i]

  # output the numbers joining each with a space between on one line
  print (" ".join(str(x) for x in nums[0:num]))

  # output the list
  print nums

#####################
# the "boss" function
#####################

def main():
  num_numbers = 0   # initialize num_numbers to 0
  a = [0.0] * 10    # initialize a list of 10 floating point values to 0.0

  num_numbers = get_numbers(a)
  print_numbers(a, num_numbers)

# if python program was executed from this source code
if __name__ == "__main__":
  main()

Answer 1

####indentations(tabs) may get disturbed...please refer pic

# get the numbers and input into the list

def get_numbers(nums):

# stop when -ve is entered

i = 0;

while i < 100:## only hundred numbers

nums[i] = float(input("Enter a number: "))

if nums[i]<0:

break

i = i + 1

return i # returning the total number of numbers entered

# output all num numbers

def print_numbers(nums, num):

###sort

for i in range(num):

max_idx = i

for j in range(i+1, num):

if nums[max_idx] < nums[j]:

max_idx = j

# Swap the found maximum element with

# the first element

nums[i], nums[max_idx] = nums[max_idx], nums[i]

# output each number one line at a time

for i in range(num):

print(nums[i])

# output the numbers joining each with a space between on one line

print(" ".join(str(x) for x in nums[0:num]))

# output the list

print(nums[:num])

#####################

# the "boss" function

#####################

def main():

num_numbers = 0 # initialize num_numbers to 0

a = [0.0] * 10 # initialize a list of 10 floating point values to 0.0

num_numbers = get_numbers(a)

print_numbers(a, num_numbers)

if(num_numbers%2==1):

print("Median=",a[num_numbers//2])

else:

print("Median=",(a[(num_numbers//2)-1]+a[(num_numbers//2)])/2)

# if python program was executed from this source code

if __name__ == "__main__":

main()