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#include <stdio.h> struct X { Deep C

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#include <stdio.h> struct X { int a; char b; int c; }; int main(void) { printf("%zun", sizeof(int)); printf("%zun", sizeof(char)); printf("%zun", sizeof(struct X)); } so what if I add a char d to the struct? If you add it to the end of the struct, my guess is that the size of the struct becomes 16 on your machine. This is first of all because 13 would be a not soefficient size, what if you have an array of struct X objects? But if you add it just after char b, then 12 is a more plausible answer. So why doesn’t the compiler reorder the members in the structure to optimize memory usage, and execution speed? Some languages actually do that, but C and C++ don’t.

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