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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)); } 4, 1, 12 is indeed what I get on my machine. Why 12? It is very expensive to work on subword data types, so the compiler will optimizethe code by making sure that c is on a word boundary by adding some padding. Also elements in an array of struct X will now align on word-boundaries. Why is it expensive to work on values that are not aligned?

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