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1 | .\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>. |
| 2 | .\" | |
| 3 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 4 | .\" manual provided the copyright notice and this permission notice are | |
| 5 | .\" preserved on all copies. | |
| 6 | .\" | |
| 7 | .\" Permission is granted to copy and distribute modified versions of this | |
| 8 | .\" manual under the conditions for verbatim copying, provided that the | |
| 9 | .\" entire resulting derived work is distributed under the terms of a | |
| 10 | .\" permission notice identical to this one. | |
| c13182ef | 11 | .\" |
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12 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 13 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 14 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 15 | .\" the use of the information contained herein. The author(s) may not | |
| 16 | .\" have taken the same level of care in the production of this manual, | |
| 17 | .\" which is licensed free of charge, as they might when working | |
| 18 | .\" professionally. | |
| c13182ef | 19 | .\" |
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20 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 21 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 22 | .\" | |
| 23 | .TH FINITE 3 2004-10-31 "" "Linux Programmer's Manual" | |
| 24 | .SH NAME | |
| 25 | finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl \- | |
| 26 | BSD floating point classification functions | |
| 27 | .SH SYNOPSIS | |
| 28 | .nf | |
| 29 | #define _BSD_SOURCE | |
| 30 | .br | |
| 31 | .B #include <math.h> | |
| 32 | .sp | |
| 33 | .BI "int finite(double " x ); | |
| 34 | .br | |
| 35 | .BI "int finitef(float " x ); | |
| 36 | .br | |
| 37 | .BI "int finitel(long double " x ); | |
| 38 | .sp | |
| 39 | .BI "int isinf(double " x ); | |
| 40 | .br | |
| 41 | .BI "int isinff(float " x ); | |
| 42 | .br | |
| 43 | .BI "int isinfl(long double " x ); | |
| 44 | .sp | |
| 45 | .BI "int isnan(double " x ); | |
| 46 | .br | |
| 47 | .BI "int isnanf(float " x ); | |
| 48 | .br | |
| 49 | .BI "int isnanl(long double " x ); | |
| 50 | .fi | |
| 51 | .SH DESCRIPTION | |
| 52 | The | |
| e511ffb6 | 53 | .BR finite () |
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54 | functions return a non-zero value if \fIx\fP is neither infinite |
| 55 | nor a "not-a-number" (NaN) value, and 0 otherwise. | |
| 56 | ||
| 57 | The | |
| e511ffb6 | 58 | .BR isnan () |
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59 | functions return a non-zero value if \fIx\fP is a NaN value, |
| 60 | and 0 otherwise. | |
| 61 | ||
| 62 | The | |
| e511ffb6 | 63 | .BR isinf () |
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64 | functions return 1 if \fIx\fP is plus infinity, \-1 is \fIx\fP |
| 65 | is minus infinity, and 0 otherwise. | |
| 19c98696 | 66 | .SH NOTES |
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67 | Note that these functions are obsolete. |
| 68 | C99 defines macros | |
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69 | isfinite(), isinf() and isnan() (for all types) replacing them. |
| 70 | Further note that the C99 isinf() has weaker guarantees on the return value. | |
| 71 | See | |
| 72 | .BR fpclassify (3). | |
| 73 | .\" | |
| 74 | .\" finite* not on HP-UX; they exist on Tru64. | |
| 105482f2 | 75 | |
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76 | On a glibc system, these functions are declared by |
| 77 | .I <math.h> | |
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78 | when |
| 79 | .B _BSD_SOURCE | |
| 80 | or | |
| 81 | .B _SVID_SOURCE | |
| 82 | or | |
| 83 | .B _GNU_SOURCE | |
| 84 | is defined. | |
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85 | The isnan() functions will also be declared when |
| 86 | .B _XOPEN_SOURCE | |
| fea681da | 87 | is defined. |
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88 | .\" .SH HISTORY |
| 89 | .\" The | |
| 90 | .\" .BR finite () | |
| 91 | .\" function occurs in 4.3BSD. | |
| b14d4aa5 | 92 | .\" see IEEE.3 in the 4.3BSD manual |
| fea681da | 93 | .SH "SEE ALSO" |
| 50e5322c | 94 | .BR fpclassify (3), |
| a8e7c990 | 95 | .BR feature_test_macros (7) |