only check for positive powers of 2
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@ -10,10 +10,8 @@ int n, *ref_exp;
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int exp;
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int exp;
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exp= 0;
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exp= 0;
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if (n<0)
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n= -n;
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if (!n)
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if (n <= 0)
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return 0;
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return 0;
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while (!(n % 2))
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while (!(n % 2))
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