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how does array[100] = {0} set the entire array to 0?
how to initialize a char array?
In c++, I want to initialize char array to 0s array.
Will "char a[4096] = {0};" do this?
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9Yes. This comment has more than 15 characters. – R. Martinho Fernandes Dec 03 '12 at 14:12
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Just use memset(a, 0x00, 4096); – SinisterMJ Dec 03 '12 at 14:12
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6@AntonRoth The OP's solution is safer - there's no risk of missing some elements or writing past the end of the array. – Angew is no longer proud of SO Dec 03 '12 at 14:15
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1BTW, `char a[4096] = {}` will also work. – iammilind Dec 03 '12 at 14:17
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@Anton if anything, use `std::fill`. There are way too many posts showing how many bugs PVS-Studio finds in open-source projects that involve `memset` and friends. `memset` gives you more than `std::fill`, namely, more potential for bugs. – R. Martinho Fernandes Dec 03 '12 at 14:18
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Yes it will... but keep in mind that a char being 0 is ASCII NULL... if you want it initialized to all '0' (character 0's) that won't work.
In this case:
memset(a, '0', 10);
Would be a better way to go... or
std::fill(std::begin(a), std::end(a), '0');
Would be better yet.
Mike
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2`std::fill(std::begin(a), std::end(a), '0');` would be even better. (notice how it *always* means "fill the whole array with zeros" and not "fill N elements of the array with zeros"; reminds me of Perl's "do what I mean" motto) – R. Martinho Fernandes Dec 03 '12 at 14:20
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@R.MartinhoFernandes - Good one, coming from a C background I'm not always aware of the nice standard methods like this. I've updated the answer to include your comment. Thanks for the input! – Mike Dec 03 '12 at 14:29
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Yes.
(And this answer has at least 30 characters as well.)