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#include <stdio.h>
typedef struct
{
double average;
int count;
}
stats_type;
static void
testc (stats_type *s, long long data)
{
s->average = (s->average * s->count + data) / (s->count + 1);
s->count++;
}
int main (void)
{
stats_type s;
s.average = 0;
s.count = 0;
testc (&s, 10);
testc (&s, 20);
printf ("%g %d\n", s.average, s.count);
return 0;
}
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