Palindrome (euler project)

Question

I am trying solve this problem with Python:

"Find the largest palindrome made from the product of two 3-digit numbers." This is my code:

list_number = reversed(range(10000, 998002))


def check_number(x): 
    for element in reversed(range(100, 1000)):
        while True:
            if x >= 100:
                if element * x == i:
                    print(i)
                    break
                else:
                    x -= 1
                    continue
            else:
                break


for i in list_number:    
    if str(i) == str(i)[::-1]:
        check_number(999)
    else:
        continue

The code works with 2-digit numbers but not with 3-digit numbers. Can someone pleas tell me what is incorrect?

For info, you can do `range(998002, 10000, -1) to step down through a range. — match, Jan 13 '18 at 22:25
Yeah I already know that but I am still new so I try different things — Mampel, Jan 13 '18 at 22:31
Also the loop uses `i` but this isn't defined anywhere - what is this meant to be? — match, Jan 13 '18 at 22:41

score 0 · Accepted Answer · answered Jan 14 '18 at 00:41

0

You code is extremely badly written, but the real problem is in the statement x -= 1: The value of x is decremented at each iteration of the inner loop and at the end of the first inner loop, x is 99. This makes the condition if x >= 100 false for all consequent iterations of the outer loop.

Add x=999 immediately after for element in reversed(range(100, 1000)). Or, better, learn some good programming and rewrite the program entirely.

answered Jan 14 '18 at 00:41

DYZ

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Thank you for your comment, I am still a beginner so I am still learning, I know the code is not perfect but I learn python since a few weeks, I'll try to improve the code a bit! – Mampel Jan 14 '18 at 08:28

Palindrome (euler project)

1 Answers1