C89, C99, C11: All the specifics that I know

before anything.. sizeof is an operand! 

sizeof is an operand!

sizeof is an operand!

重要なことは三回にしませんね！

int *ptr;

sizeof *ptr; = sizeof (int);

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compile in some standard by: -ansi,-std=c99,-std=c11,-std=gnu90,-std=gnu99,-std=gnu11.

with -pedantic follows the standard strictly.

C89 is called ANSI C..

Starting from C99, we have designated initialization for struct, union and arrarys.. by struct foo foo = {.a=1}; and int a[] = {[2]=3};

Starting from C11, we have the anonymous unions(structs..)

Starting from C99, we have bool(actually _Bool) type, which is not typedefd from char like that in C89, which might causing type conversion problem: (bool) 0x100000000 = false in C89(true in C99?).

Starting from C89, void* can be implicitly converted to any pointer. So in C programming, malloc are conventionally without forced conversion. But in C++, malloc without forced conversion will prompt for warning or even error..