__fp_cast() — cast between floating-point data types
Standards
| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
| Both | OS/390® V2R6 |
Syntax
#include <_Ieee754.h>
int __fp_cast(int mode, void *src_ptr, int src_type,
void *trg_ptr, int trg_type);General description
The __fp_cast() function casts between C floating-point data types, when the data format does not match the format specified by the FLOAT compiler option. The mode parameter indicates the format of source and target floating-point values pointed to by src_ptr and trg_ptr. Valid values for the mode parameter are _FP_HFP_MODE for hexadecimal floating-point format and _FP_BFP_MODE for IEEE floating-point format.
src_type and trg_type indicate the C data type (float, double, or long double) of the source and target floating-point values, respectively. Valid values for src_type and trg_type are _FP_FLOAT, _FP_DOUBLE or _FP_LONG_DOUBLE.
Return values
If invalid values for mode, src_type or trg_type are specified, __fp_cast() returns -1. Otherwise, it performs the requested cast and returns 0.