#include <iostream>
using namespace std;
int main() {
int i;
int s = 0;
float d;
for(i=0; i < 5; i++){
s = s + i;
cout << s << "\n";
}
d = s*1.0/i;
cout << "i = " << i << " s = " << s << "\n";
cout << "d = " << d << "\n";
return 0;
}
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