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fpclassify.3p (2494B)

    

  1. '\" et
  2. .TH FPCLASSIFY "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
  3. .\"
  4. .SH PROLOG
  5. This manual page is part of the POSIX Programmer's Manual.
  6. The Linux implementation of this interface may differ (consult
  7. the corresponding Linux manual page for details of Linux behavior),
  8. or the interface may not be implemented on Linux.
  9. .\"
  10. .SH NAME
  11. fpclassify
  12. \(em classify real floating type
  13. .SH SYNOPSIS
  14. .LP
  15. .nf
  16. #include <math.h>
  17. .P
  18. int fpclassify(real-floating \fIx\fP);
  19. .fi
  20. .SH DESCRIPTION
  21. The functionality described on this reference page is aligned with the
  22. ISO\ C standard. Any conflict between the requirements described here and the
  23. ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
  24. .P
  25. The
  26. \fIfpclassify\fR()
  27. macro shall classify its argument value as NaN, infinite, normal,
  28. subnormal, zero, or into another implementation-defined category.
  29. First, an argument represented in a format wider than its semantic type
  30. is converted to its semantic type. Then classification is based on the
  31. type of the argument.
  32. .SH "RETURN VALUE"
  33. The
  34. \fIfpclassify\fR()
  35. macro shall return the value of the number classification macro
  36. appropriate to the value of its argument.
  37. .SH ERRORS
  38. No errors are defined.
  39. .LP
  40. .IR "The following sections are informative."
  41. .SH EXAMPLES
  42. None.
  43. .SH "APPLICATION USAGE"
  44. None.
  45. .SH RATIONALE
  46. None.
  47. .SH "FUTURE DIRECTIONS"
  48. None.
  49. .SH "SEE ALSO"
  50. .IR "\fIisfinite\fR\^(\|)",
  51. .IR "\fIisinf\fR\^(\|)",
  52. .IR "\fIisnan\fR\^(\|)",
  53. .IR "\fIisnormal\fR\^(\|)",
  54. .IR "\fIsignbit\fR\^(\|)"
  55. .P
  56. The Base Definitions volume of POSIX.1\(hy2017,
  57. .IR "\fB<math.h>\fP"
  58. .\"
  59. .SH COPYRIGHT
  60. Portions of this text are reprinted and reproduced in electronic form
  61. from IEEE Std 1003.1-2017, Standard for Information Technology
  62. -- Portable Operating System Interface (POSIX), The Open Group Base
  63. Specifications Issue 7, 2018 Edition,
  64. Copyright (C) 2018 by the Institute of
  65. Electrical and Electronics Engineers, Inc and The Open Group.
  66. In the event of any discrepancy between this version and the original IEEE and
  67. The Open Group Standard, the original IEEE and The Open Group Standard
  68. is the referee document. The original Standard can be obtained online at
  69. http://www.opengroup.org/unix/online.html .
  70. .PP
  71. Any typographical or formatting errors that appear
  72. in this page are most likely
  73. to have been introduced during the conversion of the source files to
  74. man page format. To report such errors, see
  75. https://www.kernel.org/doc/man-pages/reporting_bugs.html .