cc [ flags ] -I/usr/local/include file(s) -L/usr/local/lib -lmcw [ ... ] #include <mathcw.h> #include <cvticw.h> extern float cvtiof (const char *s, char **endptr); extern double cvtio (const char *s, char **endptr); extern long double cvtiol (const char *s, char **endptr); extern __float80 cvtiow (const char *s, char **endptr); extern __float128 cvtioq (const char *s, char **endptr); extern long_long_double cvtioll (const char *s, char **endptr); extern decimal_float cvtiodf (const char *s, char **endptr); extern decimal_double cvtiod (const char *s, char **endptr); extern decimal_long_double cvtiodl (const char *s, char **endptr); extern decimal_long_long_double cvtiodll (const char *s, char **endptr);
NB: Functions with prototypes containing underscores in type names may be available only with certain extended compilers.
0o1.44417666p+1 +0o1.44417666p1 0o1.444_176_652_104_132_141_064_611_431_424_270_033_4p+000_001 0O1.444_176_652_104_132_141_064_611_431_424_270_033_4P+000_001
As illustrated, digits in the significand and/or exponent may be separated by a single underscore for enhanced readability, and lettercase is not significant.
Exponents of octal floating-point numbers are decimal values that represent powers of two.
Numbers may contain valid C-style numeric-precision suffixes: f or F (float), l or L (long double), ll or LL (long_long_double), df or DF (decimal_float), dd or DD (decimal_double), dl or DL (decimal_long_double), and dll or DLL (decimal_long_long_double). However, the suffix does not determine the final numerical precision: that is set by the declared precision of the conversion function.
Lettercase is not significant in Infinity and NaN representations. Acceptable strings include ones like these:
Inf -INFINITY +INF -NaN(0xfeedface) NaN(0xfacade) -NaN +NaN QNAN(0x1234) +QNAN(0xacceded) +QNAN QNAN SNaN(0xbead6789) snan(0xbeef) -snan(0XEFFACEABLE) SNAN(cafe_feed) -snan snan SNaN SNAN
Although all IEEE 754 floating-point designs support a sign on NaNs, the sign has no significance.
In the current implementation, a parenthesized hexadecimal tag, optionally prefixed with 0x or 0X, and possibly containing underscore digit separators, is recognized in a NaN as long as the parentheses are balanced, and low-order bits of the tag are installed in the payload bits of the significand of the NaN.
QNaN (quiet NaN) and SNaN (signaling NaN) are distinguishable on most systems, except on the widely-used Intel IA-32 architecture, the Java Virtual Machine, and possibly also the Microsoft .NET Framework Common Language Infrastructure (CLI) virtual machine.
The global variable errno defined in <errno.h> is set to EDOM for NaN conversion, and to ERANGE if a numeric string underflows or overflows. Conversion of Infinity strings does not set errno.