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If I'm not using Camel case, which I rarely stray from, I'll use underscores without a second thought.
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But... do you mix the styles? 
Next you will say, you mix gin with water 
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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I occasionally use underscores to follow low-level C++ conventions, like defining signal_t or main_t as the type for a POSIX signal or the value returned by main. And the name of a private data member ends in an underscore.
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Greg Utas wrote: the name of a private data member ends in an underscore.
You heathen. Everyone knows that private member names begin with an underscore.
Software Zen: delete this;
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Everyone knows that identifiers starting with an underscore are reserved for the implementation.
Keep Calm and Carry On
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It is reserved for those who implement things like the standard library that usually comes with your compiler. Using a beginning underscore for member names or inside a function is legal, but not recommended. But, that being said, when I write classes in the standard C++ format (all lowercase), I use a trailing underscore to distinguish member variables from local variables.
INTP
"Program testing can be used to show the presence of bugs, but never to show their absence." - Edsger Dijkstra
"I have never been lost, but I will admit to being confused for several weeks. " - Daniel Boone
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Yes, but I relented on that issue in order to achieve a compromise on underscores. I didn't want underscores in the leading position at all, while Mr. Object wanted underscores to be prohibited unless they were in the leading position indicating scope. I use underscores in locals which for me are generally all lower case. I also use underscores in globals when the name includes an acronym: ObjectABC_Factory, for example, where ABC is the acronym.
Back story: My group has a naming convention and coding style document that is 1½ pages, and most of it recommends rather requires or prohibits. In fact, I think there's only one thing in it that is absolutely prohibited, and that's Hungarian notation. When we created this document in 2000, that was still quite a thing when doing Windows programming. The only place we allow it to be used is in argument names for callback functions, and they are recommended to use the same names as in the documentation.
For what it's worth, we've never had a conflict between our use of leading underscores and any compiler in the last 20 years, and that's spread over tens of millions of lines of C, C++, and C# code.
Software Zen: delete this;
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Gary R. Wheeler wrote: there's only one thing in it that is absolutely prohibited, and that's Hungarian notation
FTMFW! The worst shite ever dreamt up.
I found a post about leading underscores which also pointed out that the trailing _t's that I occasionally use are reserved in POSIX standards. Yawn.
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Is that Apps Hungarian or Systems Hungarian?
Systems Hungarian is indeed "The worst shite ever dreamt up", but Apps Hungarian I can understand even if I don't use it.
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I had to look this up, because I didn't realize there were two variants. So thanks for prompting that!
Apps Hungarian isn't as bad, but arcane prefixed abbreviations to denote a purpose don't appeal to me. If something has a small scope, such as a loop variable, a single letter often works as a name. If it has a large scope, I'd rather see it spelled out.
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The original Hungarian notation was actually supposed to be useful at the time. The prefix should have been a 'type' as in 'size', 'color', 'frequency', 'voltage', etc. So if you defined your variables as;
float szAnimal, szElephant
float colAnimal, colElephant
float vLethal
Then when you looked at the code, the line:
szAnimal = colElephant * 0.5
Should ring alarm bells, while:
vLethal = VoltagToKillBySize(szElephant)
is fine!
Of course, once idiots started using stupid prefixes like iCount, fWeight, pData and similar it became the spawn of the devil and was rightly banned by all sane people.
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k5054 wrote: Everyone knows that identifiers starting with an underscore are reserved for the implementation.
Let me just check that I get this right now: Identifiers not starting with an underscore is for those modules that are not yet implemented. ... Did I get it right this time=?
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The way I understood it is that identifiers that begin with _ are private or supposedly private (for languages that don't enforce such thing) those that don't are public
I might very well be wrong
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Nelek wrote: gin with water
What's wrong with that? A dash of Angostura and you have a delicious pink gin. Which reminds me ...
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I suppose you know the three ways of drinking whisky? With water, without water and like water.
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To be honest... no, I didn't know it. But I will remember it Is a good one
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Do not drink pure water! You absolutely have to dilute water with alcohol. 100% water will cause rust! 
Get me coffee and no one gets hurt!
modified 4-May-20 18:28pm.
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Marc Clifton wrote: Look, either use underscores or don't.
Don't!
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Interesting. I wouldn't have even cared. 
Social Media - A platform that makes it easier for the crazies to find each other.
Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.
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Either, you have to re-invent every wheel yourself ...
Or you'll just have to be prepared for mixed styles. If you use libraries, type/class definitions, ... whatever developed by others than yourself, you better be prepared for accepting mixed styles with regard to casing, use of underscores, indentation rules (e.g. in header files - you will see them even if you don't see the source code of that library), commenting style (/* */ comment blocks, end-of-line comments, no comments, ...), use of abbreviations in identifiers, ...
Sometimes you see conflicting styles even in a single product. The Win32 functions has a subset of functions taking all essential parameters as a single struct, headed by the struct size, so new extensions to the interface can add is parameter to the end of the struct; the size field indicates which version the caller wants to run. But most functions come in version Func, FuncEx, FuncExEx, ... FuncExExExExEx (yes, five times "Ex" has occurred!), each with its own parameter format/sequence. When your personal preference is strongly with the one style that is used the least, you end up bitching a lot "Why couldn't they always use..." when you type those Ex Ex Ex...
In Norwegian culture, "Aunt Sophie" is a well known figure. Anyone who grew up in Norway since the 1950 knows Torbjørn Egner's "Cardamom Town"[^] story (it has been translated into many languages, so you might know it from your own childhood!). In this story, aunt Sophie is constantly complaining "If just people were like me, the world would be a much better place!" "Aunt Sophie's angry song"[^] is well know to every Norwegian child. Too bad I didn't find an English version!
If you are accused of being an "Aunt Sophie", it means that you are unconditionally requiring everybody to follow your rules, your ideas of what people should think, how they should behave, and everything else, disregaring any counter argument. Being called an Aunt Sophie is certainly not meant as any sort of flattery! I would certainly not like such an accusation!
So I accept reality. There are various established styles out there. You may, in the name of "consistency" cling to your own style, come sun or come rain. Or you may go for the "When in Rome, do as the Romans" (although I know that is a very un-American approach...), adapting your own style to that of the library / subsystem / whatever your are interacting with.
But basing your entire private, political, professional or other life on the premise that everbody will think like you, behave like your, is doomed to failure.
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From Aunt Sophie's own dictionary:
selfish adj. Defines someone who does not think of me.
"Five fruits and vegetables a day? What a joke!
Personally, after the third watermelon, I'm full."
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You also don't know how to use the apostrophe. APIs 🤦♀️
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I agree completely.
Consistency eases the mind and the eye, clearing your head to think about important matters instead of how this particular variable is cased.
Consistency in code can reduce errors and so create consistent quality as well (or maybe it's the other way around).
If I find inconsistent code I immediately assume it's written by some bungler who was so occupied understanding basic programming that there was simply no mental space left for consistency.
And usually I'm right.
If you can't even get consistency right, the rest of the code probably sucks as well.
When I look at that library I also see variables such as "username_val", where I presume "val" is short for "value".
What else than a value are you going to enter anyway? 
It seems like an API created by a government, 'nuff said 
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