<pre>public static double recur(int n) { if(n==0) return 1; else if(n>0) return (recur(n-1)*10); else return (1/recur(-n); }
public static double iter(int n) { double r = 1; if(n > 0){ for(int i = 0; i < n; ++i) r *= 10; } else { for(int i = 0; i < n; ++i) r /= 10; } return r; }
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