libm

what is libc? what are the functions it includes? how can we get the source code of it?

由 こ雲淡風輕ζ 提交于 2021-02-07 13:53:40
问题 As per Wikipedia there are many variants of standard C library based on operating system and compilers. Ref: http://en.wikipedia.org/wiki/C_standard_library But I want to understand that how plenty of functions which are declared in different headers(eg: stdio.h, string.h, stdlib.h etc. ) are defined in single library. Is the source code file is same for all these header files or there are different libraries for stdio.h, string.h etc? As I am beginner to programming I don't know if multiple

what is libc? what are the functions it includes? how can we get the source code of it?

由 亡梦爱人 提交于 2021-02-07 13:53:26
问题 As per Wikipedia there are many variants of standard C library based on operating system and compilers. Ref: http://en.wikipedia.org/wiki/C_standard_library But I want to understand that how plenty of functions which are declared in different headers(eg: stdio.h, string.h, stdlib.h etc. ) are defined in single library. Is the source code file is same for all these header files or there are different libraries for stdio.h, string.h etc? As I am beginner to programming I don't know if multiple

How should I obtain the fractional part of a floating-point value?

由 ≯℡__Kan透↙ 提交于 2021-01-27 12:16:26
问题 I have a variable x of type float , and I need its fractional part. I know I can get it with x - floorf(x) , or fmodf(x, 1.0f) My questions: Is one of these always preferable to the other? Are they effectively the same? Is there a third alternative I might consider? Notes: If the answer depends on the processor I'm using, let's make it x86_64, and if you can elaborate about other processors that would be nice. Please make sure and refer to the behavior on negative values of x . I don't mind

jq: error: round/0 is not defined at <top-level>

由 杀马特。学长 韩版系。学妹 提交于 2020-05-30 07:37:45
问题 round function in jq doesn't work. $ jq '10.01 | round' jq: error: round/0 is not defined at <top-level>, line 1: 10.01 | round jq: 1 compile error $ jq --help jq - commandline JSON processor [version 1.5-1-a5b5cbe] What I need to do? 回答1: Seems like round is unavailable in your build. Either upgrade jq or implement round using floor : def round: . + 0.5 | floor; Usage example: $ jq -n 'def round: . + 0.5 | floor; 10.01 | round' 10 来源： https://stackoverflow.com/questions/56593531/jq-error

NDK: libm static linking

由 ◇◆丶佛笑我妖孽 提交于 2019-12-21 10:20:25
问题 I have a problem during try to compile sources with recent android-9 x86 platform. Primary question: why static library libm.a and dynamic libm.so are different? Problem is i've try to compile: /path/to/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/linux-x86/bin/i686-android-linux-gcc --sysroot=/path/to/android-ndk-r8/platforms/android-9/arch-x86 -I/path/to/android-ndk-r8/sources/cxx-stl/gnu-libstdc++/include -I/path/to/android-ndk-r8/sources/cxx-stl/gnu-libstdc++/libs/x86/include -L/path/to

NDK: libm static linking

由 自作多情 提交于 2019-12-21 10:20:17
问题 I have a problem during try to compile sources with recent android-9 x86 platform. Primary question: why static library libm.a and dynamic libm.so are different? Problem is i've try to compile: /path/to/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/linux-x86/bin/i686-android-linux-gcc --sysroot=/path/to/android-ndk-r8/platforms/android-9/arch-x86 -I/path/to/android-ndk-r8/sources/cxx-stl/gnu-libstdc++/include -I/path/to/android-ndk-r8/sources/cxx-stl/gnu-libstdc++/libs/x86/include -L/path/to

Fedora dynamic replacement for libm.a(static lib)?

由 守給你的承諾、 提交于 2019-12-12 03:53:40
问题 I'm just trying to figure it out, why Fedora has not the static library libm.a , and if it is a fact, which i should use ? As mentioned here in StackOverflow i can simply install the pkg from yum , but is acceptable to think that Fedora have a replacement as default lib instead.No? edited I'm trying to compile this: #include <stdio.h> #include <stdlib.h> void fred(int arg) { printf("fred: you passed %d\n", arg); } and the output is this: $ gcc -o fred fred.c /usr/lib64/libm.so /usr/lib/gcc

why there is no static library for math functions?

由 ≯℡__Kan透↙ 提交于 2019-12-07 03:14:49
问题 Is it a standard to have only dynamic libraries mostly without their static version? I am particularly asking about math library. In my fedora 17 (linux machine on Intel 32 processor), I have latest gcc and it has libm-2.15.so and symbolic link file libm.so but there is no libm.a. Is libm.a missing on my system? 回答1: Install the static libraries: # yum install glibc-static 回答2: generally the .somand .a exist at the same time, but dll comes first. maybe the static library is missing, you can

why there is no static library for math functions?

由 旧街凉风 提交于 2019-12-05 08:07:20
Is it a standard to have only dynamic libraries mostly without their static version? I am particularly asking about math library. In my fedora 17 (linux machine on Intel 32 processor), I have latest gcc and it has libm-2.15.so and symbolic link file libm.so but there is no libm.a. Is libm.a missing on my system? Install the static libraries: # yum install glibc-static generally the .somand .a exist at the same time, but dll comes first. maybe the static library is missing, you can try yum command as nirk said. You ask: Is it a standard to have only dynamic libraries mostly without their static
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