Why do I need a standard code?

Question

Often I see people arguing that the code is not standard. what do they really mean?

for example, if I said:

itoa () to convert an integer to a character, and they will ignore it, implying that "the code is non-standard!".

Answer 1

Some implementations of the C ++ standard allow certain things that are not allowed.

If you use these functions, you can say that your code is not up to standard.

Example:

int x = 5;
char arr[x];

The above code is not allowed in the C ++ 03 standard, but is allowed in C99. At the same time, some compilers claiming to implement C ++ 03 can use this code in a C ++ program.

Answer 2

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Answer 3

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Answer 6

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Answer 8

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Answer 9

One strange function that I saw in the compiler that comes with UBuntuis that you can dereference an uninitialized pointer. And it just happened using memory in my program space.

I don’t know which version of UBuntu, but my professor and I were very puzzled to see this. And I remember that in this case the result is 1.