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#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define NUM_ELEM(a) (sizeof(a) / sizeof((a)[0]))
int i;
memset((void *)a, 0, sizeof(a));
memset((void *)b, 0, sizeof(b));
for (i = 0; i < MIN(NUM_ELEM(a), NUM_ELEM(b)); i++)
a[i] += b[i];