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#include <math.h>
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double frexp(double x, int *i)
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{
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double rv = x;
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int sign=1;
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int ri = 0;
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if (rv < 0)
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{
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sign = -1;
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rv = -rv;
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}
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while (rv > 1)
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{
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ri++;
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rv /= 2.0;
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}
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while (rv < 0.5)
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{
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ri--;
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rv *= 2;
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}
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*i = ri;
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return rv*sign;
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}
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