B: overflow = .short( &single, &dbl );
C: #equate _short .short int _short(float *single, double *dbl);
.SHORT is used to round a double precision floating point value to single precision. If floating underflow occurs during rounding, 0.0 is stored in "single". Note that you pass pointers to the memory locations where the values are stored; you do not pass the values themselves.
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