Oh the hatred I had , I was making a financial estimate for my maternal uncle who is an engineer

and I am not sure what the issue was , maybe it was leading 0 part because ending 0 part would be preserved , it happened like 2 years ago.

Also , I think the problem had actually been of libreoffice or whatever , oh yeah it was .00 , I wanted that .00 but it just removed it.

Like I said , I don't remember it. and I don't even remember how I fixed it , but I only remember the pain because it felt so simple yet it doesn't .... , I really wanted to use some python esq interface on something like libreoffice as well because my uncle had a pdf which had a column for the material code (like something like 1.1.2) and then it had a description and a name and I Had to copy material code from 1.1.2 and then paste it.

And he said that there was some other engineer in his department who had actually figured out where he would only type in 1.1.2 for example and on the next column, it would show up automatically , It was kind of crazy but I was thinking of creating a cloud service for such engineers which only had this (are there excel extensions ?) , or whatever because there are so many such engineers & my uncle would've definitely paid 10$ if it made his job easier since he always used to force some of us kids to do it for him. He just couldn't figure out how to do it himself and I don't blame him.

Zip codes I sleep.

You don't want to know how many phone numbers in various databases show up in exponential notation. Not gonna talk about it.

That because Excel defaults to treating numeric data as a number and leading zeros are extraneous and it will strip them off before storing the value (and it will right justify the display).

The root issue is that zipcodes though numeric in content (at least in the US) should not be treated as number (data type) but instead as a text (string) value

To tell Excel to treat this numeric data as a string you to either

* Precede the value with a single quote (') - Excel will treat the rest of the data as a string (and won't hide the leading zeros)

* Before entering the value set the format to TEXT which will tell Excel to take the entry verbatim with no inferring what the data represents (i.e. a number or date)

And instead of just copy/pasting tabular data, use the Text Import Wizard (my translation) under the Paste drop-down menu, and ensure appropriate columns are marked as text.

Leading zeros are not extraneous and should not be removed though

Aren't they exactly the definition of "extraneous"?

For numbers they are extraneous, for strings of digits they are not.

They are never extraneous, cause no automatic calculation process produces them. If they are there, it's intentional.

It is the fault of zip codes, they should have been prefixed with the state code from the start (CA for California and so on), that's one of the reasons secret 2FA codes are sometimes preceded with one or two letters (e.g. Facebook uses FB)

The issue with that is that ZIP codes don’t map physical locations, they map the hierarchy of how the mail system does routing down to each post office and were introduced in the 1960s [0].

As a result, doing something “from the start” wouldn’t involve baking in comparability with the quirks of a piece of software written decades later, and you’d also have issues with, for example, single zip codes spanning multiple states.

[0]: https://en.m.wikipedia.org/wiki/ZIP_Code

Well, then something that made more sense, like the letter Z for zip code.

Zipcodes aren't really numbers, they are strings. You can't meaningfully do math on zipcodes, so better to just treat them as text.

Yes, that's the point. But excel just incorrectly determines what you meant, and corrupts your data.

>But excel just incorrectly determines what you meant

How would you, if you were programming excel, determine whether the 5-digit number entered with a leading 0 is meant to be a zip code or not?

I would not make any default determination until and unless there was a proactive user action. If there is any value that doesn't round trip through string serialization, don't allow it to be coerced without the user deciding to allow it, explicitly.

You know that many users of Excel enter numbers into the cells and then do arithmetic calculations with them right?

No, but I think it's a lot. I'd bet that the vast majority of those round-trip through string serialization, requiring no further user action based on my recommendation.

Disagree, the most common way for an experienced user to type a date into Excel is as a partial date if it is this year, eg 4-Apr, which is instantly converted to 04/04/2025 or whatever.

The vast majority of dates I personally type into Excel would be in this form.

Format the column as date. Or turn on the global option for loose type insanity.

In this thread: people who don't know how to use Excel tell people who do know, how to use it.

Would keeping the leading zero cause any problems with future calculations?

That's why Excel is cursed. It tries to interpret so many "just strings" as something else.

The postal service has learned and knows to compensate for this. If you mail something with four digits for the zip code, it will be treated as if it had a leading 0 and routed to the northeast.