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   math.h.0p    ( 10 )

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Обоснование (Rationale)

Before the ISO/IEC 9899:1999 standard, the math library was
       defined only for the floating type double.  All the names formed
       by appending 'f' or 'l' to a name in <math.h> were reserved to
       allow for the definition of float and long double libraries; and
       the ISO/IEC 9899:1999 standard provides for all three versions of
       math functions.

       The functions ecvt(), fcvt(), and gcvt() have been dropped from
       the ISO C standard since their capability is available through
       sprintf().

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