Question

Use a loop to find the sum of all numbers between 0 and #mystery_int, including bounds (meaning that if #mystery_int = 7, you add 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7).

Coding Problem 3.3.3 (External resource) 3.0 points possible) SumLoop.py 1 mystery_int -3 loop to find the sum of all numbers between 0 and 3 #Use a 4 #mystery_int, including bounds (meaning that if 5 #mystery_int = 7, you add 01 234 567) 6 # 7 #However, there's a twist: mystery_int might be negative. 8 #So, if mystery_int was -4, you wOuld -4 -3 -2 1 e 9# 10 #There are a lot of different ways you can do this. Most of 11 #them will involve using a conditional to decide whether to 12 #add or subtract 1 from mystery_int. 13 # 14 #You may use either a for loop or a while loop to solve this, 15 #although we recommend using 16 17 while loop. 18 #Add your code here! 19 sum-0 20 for i in range (0, mystery_int+1) 21 22 print (sum) 23 sum sum +i

However, there's a twist: mystery_int might be negative.
#So, if mystery_int was -4, you would -4 + -3 + -2 + -1 + 0.

Answer 1

# do comment if any problem arises

# Code

mystery_int = -3

# add your code here

sum = 0

# calculate lower bound ie from where to start loop

lower_bound = min(0, mystery_int)

# calculate upper bound ie from where to stop loop

upper_bound = max(0, mystery_int)

# loop from lower to upper bound and calculate sum

for i in range(lower_bound, upper_bound+1):

    sum += i

print(sum)

Screenshot of code:

1 # do comment if any problem arises 2 # Code mystery_int = -3 5 6 7 8 9 10 11 12 13 14 # add your code here sum = 0 # calculate lower bound ie from where to start loop lower_bound = min(O, mystery_int) # calculate upper bound ie from where to stop loop upper_bound = max(O, mystery_int) # loop from lower to upper bound and calculate sum for i in range(lower_bound, upper_bound+1): sum += i. print(sum) 15

Output: