What is the meaning of "..." in printf(const char *_Format, ...) [duplicate] - c++

This question already has answers here:
Function prototype with ellipsis [duplicate]
(1 answer)
Variable number of arguments in C++?
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Closed 5 years ago.
I think this question already exists. But I can't search for the keyword "...". How to declare and use function with "...". Hope someone can help me solve this problem. Thank you.

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Meaning of the single quotes in 998'244'353 [duplicate]

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I recently came across the following C++ code snippet:
int Mod = 998'244'353;
I was intrigued by the use of single quotes in this number.
Could someone elaborate on what this gets interpreted as and why is it accepted?
Also has this formatting always been there in c++?

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In my CPP class my professor strictly asked us to not to use goto statement as long as possible. Why is so, as I think there are no memory or any issues whatsoever with goto?

What does [^a-z0-9] means in regex? [duplicate]

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Just wondering what does [^a-z0-9] mean in regex?
I looked around this site and only find [a-z0-9], so what does the ^ symbol mean?

Work with File in windows [duplicate]

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I need a function in c++ to check if a given path/filename exists on the computer.
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question about auto in c++ [duplicate]

This question already has answers here:
Closed 12 years ago.
Possible Duplicate:
Is there any reason to use the ‘auto’ keyword in C / C++?
can anybody explain me purpose of auto keyword in c++? thanks
It's useless and is left for old code compatibility. Long ago you used it to say that a variable is automatic, this is no longer useful - all variables witout other qualifiers are treated as automatic (stack-allocated).