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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| 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| 13 | .\" manual page may be incorrect or out-of-date.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 | .\" References consulted: | |
| 24 | .\" Linux libc source code | |
| 25 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
| 26 | .\" 386BSD man pages | |
| 27 | .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu) | |
| 28 | .\" Modified 2004-10-31 by aeb | |
| 29 | .\" | |
| 30 | .TH LDEXP 3 2004-10-31 "" "Linux Programmer's Manual" | |
| 31 | .SH NAME | |
| 32 | ldexp, ldexpf, ldexpl \- multiply floating-point number by integral power of 2 | |
| 33 | .SH SYNOPSIS | |
| 34 | .nf | |
| 35 | .B #include <math.h> | |
| 36 | .sp | |
| 37 | .BI "double ldexp(double " x ", int " exp ); | |
| 38 | .br | |
| 39 | .BI "float ldexpf(float " x ", int " exp ); | |
| 40 | .br | |
| 41 | .BI "long double ldexpl(long double " x ", int " exp ); | |
| 42 | .fi | |
| 43 | .sp | |
| e9329f6d | 44 | Link with \fI-lm\fP. |
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45 | .SH DESCRIPTION |
| 46 | The | |
| 63aa9df0 | 47 | .BR ldexp () |
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48 | function returns the result of multiplying the floating-point number |
| 49 | .I x | |
| 50 | by 2 raised to the power | |
| 51 | .IR exp . | |
| 52 | .SH "CONFORMING TO" | |
| 68e1685c | 53 | SVr4, 4.3BSD, C89. |
| c13182ef | 54 | The |
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55 | .I float |
| 56 | and | |
| 57 | .I "long double" | |
| 58 | variants are C99 requirements. | |
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59 | .SH "SEE ALSO" |
| 60 | .BR frexp (3), | |
| 61 | .BR modf (3), | |
| 62 | .BR scalb (3) |