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#include <assert.h>
 
struct timer {
  unsigned char MODE;
  unsigned int DATA;
  unsigned int COUNT;
};
 
int func(void) {
  assert(sizeof(struct timer) == sizeof(unsigned char) + sizeof(unsigned int) + sizeof(unsigned int));
}

#include <assert.h>
 
struct timer {
  unsigned char MODE;
  unsigned int DATA;
  unsigned int COUNT;
};

static_assert(sizeof(struct timer) == sizeof(unsigned char) + sizeof(unsigned int) + sizeof(unsigned int),
              "Structure must not have any padding");