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#include <dos.h> extern int _8087;
This variable is provided for compatibility with other DOS compilers.
It contains 3
if a numeric coprocessor is installed, otherwise
0
. If the environment variable 387
is set to either
`y' or `n', the value of _8087
reflects the override
(i.e., _8087
is unconditionally assigned the value 3 if
387
is set to `y', 0 if it is set to `n').
not ANSI, not POSIX
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