#include <dos.h> int _detect_80387(void);
Detects whether a numeric coprocessor is present. Note that floating-point will work even without a coprocessor, due to the existence of emulation.
1 if a coprocessor is present, 0 if not.
not ANSI, not POSIX
if (_detect_80387()) printf("You have a coprocessor\n");
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