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The C and C++ Include Header Files

/usr/include/python3.10/internal/pycore_dtoa.h

$ cat -n /usr/include/python3.10/internal/pycore_dtoa.h

     1	#ifndef PY_NO_SHORT_FLOAT_REPR
     2	#ifdef __cplusplus
     3	extern "C" {
     4	#endif
     5	
     6	#ifndef Py_BUILD_CORE
     7	#  error "this header requires Py_BUILD_CORE define"
     8	#endif
     9	
    10	/* These functions are used by modules compiled as C extension like math:
    11	   they must be exported. */
    12	
    13	PyAPI_FUNC(double) _Py_dg_strtod(const char *str, char **ptr);
    14	PyAPI_FUNC(char *) _Py_dg_dtoa(double d, int mode, int ndigits,
    15	                        int *decpt, int *sign, char **rve);
    16	PyAPI_FUNC(void) _Py_dg_freedtoa(char *s);
    17	PyAPI_FUNC(double) _Py_dg_stdnan(int sign);
    18	PyAPI_FUNC(double) _Py_dg_infinity(int sign);
    19	
    20	#ifdef __cplusplus
    21	}
    22	#endif
    23	#endif   /* !PY_NO_SHORT_FLOAT_REPR */

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