Question

(+30) Provide a python program which will

1. Populate an array(list) of size 25 with integers in the range -100 (negative 100)   to +100 inclusive
2. Display the array and its length (use the len function)
3. Display the average of all the integers in the array
4. Display the number of even integers (how many)
5. Display the number of odd integers (how many)
6. Display the number of integers > 0   (how many)
7. Display the number of integers < 0   (how many)
8. Display the median.

NOTE In sorted order, the median equals the 13^th == array[12] element in the array. Please do not use array[12] to display the median instead consider n/2 or n//2 or a ceil or floor functions etc. That is the median should be calculated using n

9. Display the integers >= median   (See the : operator as in sub = array[2:6] know splice )
10. Display the integers < median see the splice operator
11. Ask the user for an integer and print the number of times the integer is in the array

HINT: see the count function below

12. Display the maximum integer
13. Display the minimum integer
14. Display the array in reverse sorted order (largest to smallest) See the sort() and reverse() functions
15. Display the gcd of the largest and smallest integers (See the lesson for an example ) using python’s gcd function
    

SAMPLE code Template ( Lab 05Template.py)

import random

import math         # needed for gcd

array = []          # empty list

a = -100     

b = 100

x = random.randint(a, b )  # Return a random integer a <= x <= b.

print("random integer x == ", x)

j = 0

n = 25                          # size of the array

while (j < n):                  # populate the array using the while loop

    x = random.randint(a, b )   # Return a random integer  a <= x <= b.

    array.append(x)             #APPEND adds to a list

    j = j + 1

print("array == ",array)        #  (2) now print the array

sub = []                     # subsequence

sub = array[2:6]                #  create a subsequence start at 2 end at 5

print ('sub ', sub)             #  (3)

# now sum

sum = 0                         #  (4)  sum

for k in array:

    sum = sum + k

print("sum == ", sum)

print(array)                     # print array and its length

print("array length is ", len(array))

array.sort()                      # sort array

print("now sorted...")

print(array)

array.reverse()                   # reverse the array

print("now sorted in reverse order...")

print(array)

print(" the first integer is ", array[0], " and the last integer...", array[len(array) -1])

odd = 0

# need a loop here...

print('the number of odd integers is ', odd  )

s = 5                          # search for an integer s using count() function

print("Is ", s, " in the array? ", array.count(s))

Answer 1

If you have any doubts, please give me comment...

import random

import math         # needed for gcd

array = []          # empty list

a = -100     

b = 100

x = random.randint(a, b )  # Return a random integer a <= x <= b.

# print("random integer x == ", x)

j = 0

n = 25                          # size of the array

while (j < n):                  # populate the array using the while loop

    x = random.randint(a, b)   # Return a random integer  a <= x <= b.

    array.append(x)             #APPEND adds to a list

    j = j + 1

print("array == ",array)        #  (2) now print the array

print("array length is ", len(array))

# now sum

sum = 0                         #  (4)  sum

for k in array:

    sum = sum + k

average = sum/len(array)

print("average:", average)

even_c = 0

odd_c = 0

for k in array:

    if k%2==0:

        even_c += 1

    else:

        odd_c += 1

pos_c = 0

neg_c = 0

for k in array:

    if k<0:

        pos_c += 1

    elif k>0:

        neg_c += 1

array.sort()

median_ind = len(array)//2

median = array[median_ind]

print("Median is:", median)

print(" >= median")

for k in array[0:median_ind+1]:

    print(k)

print(" < median")

for k in array[median_ind+1:]:

    print(k)

print("Max: "+str(array[-1]))

print("Min: "+str(array[0]))

array.reverse()

print("Reverse: "+str(array))

print("GCD: "+str(math.gcd(array[-1], array[0])))