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round.3

round.3 2.2 KB
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  1. .\" Copyright (c) 2003, Steven G. Kargl
    2. 

  2. .\" All rights reserved.
    3. 

  3. .\"
    4. 

  4. .\" Redistribution and use in source and binary forms, with or without
    5. 

  5. .\" modification, are permitted provided that the following conditions
    6. 

  6. .\" are met:
    7. 

  7. .\" 1. Redistributions of source code must retain the above copyright
    8. 

  8. .\"    notice, this list of conditions and the following disclaimer.
    9. 

  9. .\" 2. Redistributions in binary form must reproduce the above copyright
    10. 

  10. .\"    notice, this list of conditions and the following disclaimer in the
    11. 

  11. .\"    documentation and/or other materials provided with the distribution.
    12. 

  12. .\"
    13. 

  13. .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
    14. 

  14. .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    15. 

  15. .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    16. 

  16. .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
    17. 

  17. .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    18. 

  18. .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    19. 

  19. .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    20. 

  20. .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    21. 

  21. .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    22. 

  22. .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    23. 

  23. .\" SUCH DAMAGE.
    24. 

  24. .\"
    25. 

  25. .\" $FreeBSD: src/lib/msun/man/round.3,v 1.6 2005/06/15 19:04:04 ru Exp $
    26. 

  26. .\"
    27. 

  27. .Dd April 7, 2005
    28. 

  28. .Dt ROUND 3
    29. 

  29. .Os
    30. 

  30. .Sh NAME
    31. 

  31. .Nm round ,
    32. 

  32. .Nm roundf ,
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  33. .Nm roundl
    34. 

  34. .Nd round to nearest integral value
    35. 

  35. .Sh LIBRARY
    36. 

  36. .Lb libm
    37. 

  37. .Sh SYNOPSIS
    38. 

  38. .In math.h
    39. 

  39. .Ft double
    40. 

  40. .Fn round "double x"
    41. 

  41. .Ft float
    42. 

  42. .Fn roundf "float x"
    43. 

  43. .Ft "long double"
    44. 

  44. .Fn roundl "long double x"
    45. 

  45. .Sh DESCRIPTION
    46. 

  46. The
    47. 

  47. .Fn round ,
    48. 

  48. .Fn roundf ,
    49. 

  49. and
    50. 

  50. .Fn roundl
    51. 

  51. functions return the nearest integral value to
    52. 

  52. .Fa x ;
    53. 

  53. if
    54. 

  54. .Fa x
    55. 

  55. lies halfway between two integral values, then these
    56. 

  56. functions return the integral value with the larger
    57. 

  57. absolute value (i.e., they round away from zero).
    58. 

  58. .Sh SEE ALSO
    59. 

  59. .Xr ceil 3 ,
    60. 

  60. .Xr floor 3 ,
    61. 

  61. .Xr ieee 3 ,
    62. 

  62. .Xr lrint 3 ,
    63. 

  63. .Xr lround 3 ,
    64. 

  64. .Xr math 3 ,
    65. 

  65. .Xr rint 3 ,
    66. 

  66. .Xr trunc 3
    67. 

  67. .Sh STANDARDS
    68. 

  68. These functions conform to
    69. 

  69. .St -isoC-99 .
    70. 

  70. .Sh HISTORY
    71. 

  71. The
    72. 

  72. .Fn round
    73. 

  73. and
    74. 

  74. .Fn roundf
    75. 

  75. functions appeared in
    76. 

  76. .Fx 5.3 .
    77. 

  77. The
    78. 

  78. .Fn roundl
    79. 

  79. function appeared in
    80. 

  80. .Fx 6.0 .
    81.