#include <iostream>
void out_square(std::ostream& _o, int num, int cnt){
bool chk;
int len = num - 1;
for(int i = 0; i < num; ++i){
chk = (i < cnt || i > len-cnt);
for(int j = 0; j < num; ++j){
if((j < cnt) || (j > len-cnt) || chk)
_o << '*';
else
_o << ' ';
}
_o << std::endl;
}
_o.flush();
}
int main(void){
out_square(std::cout, 12, 2);
return 0;
}
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