Question

Lab 5-2 Nested Loops 2. Summation Of Numbers (using Nested While Loops) Part A: The program will calculate and display the total of all numbers up to a specific number (entered by the user). Only positive numbers are allowed. Part B: User-controlled loop Part A Input Validation loop Part A: Summation loop Examples: When 5 is entered the program will calculate the total as 1+2+...+5 and display 15. When 2 is enterered the program will calculate the total as 1+2 and display 3. Here is an example of one run of the program. Enter a positive integer number: 0 wrong input, try again. Enter a positive integer number: -2 wrong input, try again. Enter a positive integer number: 5 The sum from 1 to 5 is: 15 Tips: The solution of Part A consists of two loops (not nested!), one for the input validation (only positive integer numbers allowed), followed by a second one for the calculation of the total.

Answer 1

• Code to copy along with screenshots of code and output are provided.
• If you have any doubts or issues. Feel free to ask in comments
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============================= PART - A =================

Screenshots of Code :

1 "ll<<<<<<-------PART-A-- ->>>> 2 3 4 # taking input for first time num = int(input ("Enter a positive number: ")) 5 # while loop for input validation while num <= 0: print("wrong input, try again") num = int(input ("Enter a positive number: ")) 9 10 11 12 13 # sum varaible to store sum total = 0 # variable to control loop i = 1 14 15 16 17 18 #loop to calculate sum while ic=num: total = total + i i = i + 1 19 20 21 22 # printing sum print("The sum from 1 to 23 ,num, "is total) 24

Screenshots of Output :

Enter a positive number: -5 wrong input, try again Enter a positive number: -9 wrong input, try again Enter a positive number: 10 The sum from 1 to 10 is 55

11 Enter a positive number: 3 The sum from 1 to 3 is 6

Code to copy:

'''<<<<<<-------PART -A------->>>>>'''


# taking input for first time
num = int(input("Enter a positive number: "))

# while loop for input validation
while num <= 0:
    print("wrong input, try again")
    num = int(input("Enter a positive number: "))

# sum varaible to store sum
total = 0
# variable to control loop
i = 1

#loop to calculate sum
while i<=num:
    total = total + i
    i = i + 1

# printing sum
print("The sum from 1 to ",num, "is ",total)

=============================== PART-B ======================

Screenshots of Code :

1 ------PART -B-- 2 3 # ansver variable to store answer answer = 'y' 4 5 6 7 # loop until ansver is 'y' while answer == 'y' or answer == 'Y': # taking number input for first time num = int(input ("Enter a positive number: ")) 8 9 10 11 12 # while loop for input validation while num <= 0: print("wrong input, try again") num = int(input ("Enter a positive number: ")) 13 14 15 16 17 # sum varaible to store sum total = 0 # variable to control loop i = 1 18 19 20 21 22 # loop to calculate sum while i <= num: total = total + i i = i + 1 23 24 25 26 27 28 29 # printing sum print("The sum from 1 to ", num, "is", total) # taking input for whether want to enter another number answer = input("Do you want to enter another number? (v/n): 30 ")

Screenshots of Output :

Y Enter a positive number: -2 wrong input, try again Enter a positive number: 3 The sum from 1 to 3 is 6 Do you want to enter another number? (y/n) : Enter a positive number: -2 wrong input, try again Enter a positive number: 5 The sum from 1 to 5 is 15 Do you want to enter another number? (y/n): n Process finished with exit code 0

Code to copy:

'''<<<<<<-------PART -B------->>>>>'''

# answer variable to store answer
answer = 'y'

# loop until answer is 'y'
while answer == 'y' or answer == 'Y':
    # taking number input for first time
    num = int(input("Enter a positive number: "))

    # while loop for input validation
    while num <= 0:
        print("wrong input, try again")
        num = int(input("Enter a positive number: "))

    # sum varaible to store sum
    total = 0
    # variable to control loop
    i = 1

    # loop to calculate sum
    while i <= num:
        total = total + i
        i = i + 1

    # printing sum
    print("The sum from 1 to ", num, "is ", total)

    # taking input for whether want to enter another number
    answer = input("Do you want to enter another number?(y/n):  ")

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