Converting the code from FOR loop to WHILE loop

Question

num = int(input("Enter your number: "))

for i in range (1, num+1):
    if (i%2==0):
        i = i // 2
        print(3**(i-1))
    else:
        i = i // 2 + 1
        print(2**(i-1))

TO

num = int(input("Enter your number: "))

i=1
j=1
while j<=num and i<=num:
    if (i%2==0):
        i = i // 2
        print(3**(i-1))
    else:
        i = i // 2 + 1
        print(2**(i-1))
j+1

Facing problem in while loop conversion.
Searched this problem everywhere on the internet but unable to solve it.

j is not being incremented within the while loop, so it will never satisfy your conditions. — dshanahan
– dshanahan, Commented Dec 28, 2020 at 4:40
I think i value get changed when it enters inside the loop. So used j. Not able to find a way of incrementing the value of i. — Creepy Creature
– Creepy Creature, Commented Dec 28, 2020 at 4:42
Ok, I think I understand. You need to increment j within the loop and you will need to use j += 1 — dshanahan
– dshanahan, Commented Dec 28, 2020 at 4:45

dshanahan · Accepted Answer · 2020-12-28 04:56:59Z

1

I think this will accomplish what you want:

num = int(input("Enter your number: "))

i = 1
while i <= num:
    if (i % 2 == 0):
        print(3 ** ((i // 2) - 1))
    else:
        print(2 ** (i // 2))
    i += 1

i will increment by 1 after each loop. Which mimics for i in range(1, num + 1). i is not modified within the loop, it is only used in the printed calculation.

Note: in your for loop, your modifications to i do not affect the i variable for the loop but I would suggest that you try to avoid using the same variable name within the loop.

answered Dec 28, 2020 at 4:56

dshanahan

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