如何获取整数符号并将其存储在char中？一种方法是：
int n = -5
char c;
if(n<0)
c = '-';
else
c = '+';
或者：
char c = n < 0 ? '-' : '+';
但是有没有条件的方法吗？
答案 0 :(得分：5)
这会在x86-64上使用gcc / clang创建无分支代码：
void storeneg(int X, char *C)
{
*C='+';
*C += (X<0)*('-'-'+');
}
答案 1 :(得分：5)
有一种最高效，最便携的方法，但它并没有赢得任何美容大奖。
我们可以假设，如果有符号整数的MSB始终为负，则总是将其置位。即使考虑异国签名格式（一个补码，一个符号大小），这也是100％可移植的假设。因此，最快的方法是简单地从整数中屏蔽MSB。
在位置CHAR_BIT * sizeof(n) - 1;上可以找到任何整数的MSB。在典型的32位主流系统上，例如8 * 4 - 1 = 31。
因此我们可以编写如下函数：
_Bool is_signed (int n)
{
const unsigned int sign_bit_n = CHAR_BIT * sizeof(n) - 1;
return (_Bool) ((unsigned int)n >> sign_bit_n);
}
在x86-64 gcc 9.1（-O3）上，这会产生非常有效的代码：
is_signed:
mov eax, edi
shr eax, 31
ret
此方法的优点还在于，与诸如x < 0之类的代码不同，在移植时，它不会冒被翻译成“如果否定分支”指令的风险。
完整示例：
#include <limits.h>
#include <stdio.h>
_Bool is_signed (int n)
{
const unsigned int sign_bit_n = CHAR_BIT * sizeof(n) - 1;
return (_Bool) ((unsigned int)n >> sign_bit_n);
}
int main (void)
{
int n = -1;
const char SIGNS[] = {' ', '-'};
char sign = SIGNS[is_signed(n)];
putchar(sign);
}
反汇编（x86-64 gcc 9.1（-O3））：
is_signed:
mov eax, edi
shr eax, 31
ret
main:
sub rsp, 8
mov rsi, QWORD PTR stdout[rip]
mov edi, 45
call _IO_putc
xor eax, eax
add rsp, 8
ret
答案 2 :(得分：1)
Directory of D:\batch\tasks\shared\test-condaenv-users
06/27/2019 04:29 AM <DIR> .
06/27/2019 04:29 AM <DIR> ..
04/20/2018 01:28 PM 19,208 api-ms-win-core-console-l1-1-0.dll
04/20/2018 01:28 PM 18,696 api-ms-win-core-datetime-l1-1-0.dll
04/20/2018 01:28 PM 18,696 api-ms-win-core-debug-l1-1-0.dll
04/20/2018 01:28 PM 18,696 api-ms-win-core-errorhandling-l1-1-0.dll
04/20/2018 01:29 PM 22,280 api-ms-win-core-file-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-file-l1-2-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-file-l2-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-handle-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-heap-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-interlocked-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-core-libraryloader-l1-1-0.dll
04/20/2018 01:37 PM 21,256 api-ms-win-core-localization-l1-2-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-memory-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-namedpipe-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-core-processenvironment-l1-1-0.dll
04/20/2018 01:37 PM 20,744 api-ms-win-core-processthreads-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-processthreads-l1-1-1.dll
04/20/2018 01:37 PM 18,184 api-ms-win-core-profile-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-rtlsupport-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-string-l1-1-0.dll
04/20/2018 01:37 PM 20,744 api-ms-win-core-synch-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-synch-l1-2-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-core-sysinfo-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-timezone-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-util-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-crt-conio-l1-1-0.dll
04/20/2018 01:37 PM 22,792 api-ms-win-crt-convert-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-crt-environment-l1-1-0.dll
04/20/2018 01:37 PM 20,744 api-ms-win-crt-filesystem-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-crt-heap-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-crt-locale-l1-1-0.dll
04/20/2018 01:37 PM 27,912 api-ms-win-crt-math-l1-1-0.dll
04/20/2018 01:37 PM 26,888 api-ms-win-crt-multibyte-l1-1-0.dll
04/20/2018 01:37 PM 71,432 api-ms-win-crt-private-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-crt-process-l1-1-0.dll
04/20/2018 01:37 PM 23,304 api-ms-win-crt-runtime-l1-1-0.dll
04/20/2018 01:37 PM 24,840 api-ms-win-crt-stdio-l1-1-0.dll
04/20/2018 01:37 PM 24,840 api-ms-win-crt-string-l1-1-0.dll
04/20/2018 01:37 PM 21,256 api-ms-win-crt-time-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-crt-utility-l1-1-0.dll
11/13/2018 04:56 PM 329,368 concrt140.dll
06/27/2019 04:29 AM <DIR> conda-meta
06/27/2019 04:29 AM <DIR> DLLs
06/27/2019 04:29 AM <DIR> include
06/27/2019 04:29 AM <DIR> Lib
06/27/2019 04:29 AM <DIR> Library
06/27/2019 04:29 AM <DIR> libs
03/25/2019 08:21 PM 12,769 LICENSE_PYTHON.txt
11/13/2018 04:56 PM 625,808 msvcp140.dll
11/13/2018 04:56 PM 31,896 msvcp140_1.dll
11/13/2018 04:56 PM 195,248 msvcp140_2.dll
04/24/2019 08:30 PM 95,232 python.exe
04/24/2019 08:30 PM 438,272 python.pdb
04/24/2019 08:30 PM 51,712 python3.dll
04/24/2019 08:30 PM 3,745,792 python37.dll
04/24/2019 08:30 PM 9,523,200 python37.pdb
04/24/2019 08:30 PM 93,696 pythonw.exe
04/24/2019 08:30 PM 438,272 pythonw.pdb
06/27/2019 04:29 AM <DIR> Scripts
06/27/2019 04:29 AM <DIR> tcl
06/27/2019 04:29 AM <DIR> Tools
04/20/2018 01:37 PM 1,016,584 ucrtbase.dll
11/13/2018 04:56 PM 386,720 vccorlib140.dll
11/13/2018 04:56 PM 155,280 vcomp140.dll
11/13/2018 04:56 PM 87,200 vcruntime140.dll
56 File(s) 18,091,625 bytes
11 Dir(s) 69,282,779,136 bytes free
"\Lib"
Volume in drive D is Temporary Storage
Volume Serial Number is 2AF3-E29E
Directory of D:\batch\tasks\shared\test-condaenv-users\Lib
06/27/2019 04:29 AM <DIR> .
06/27/2019 04:29 AM <DIR> ..
03/25/2019 08:21 PM 5,580 abc.py
03/25/2019 08:21 PM 32,814 aifc.py
03/25/2019 08:21 PM 477 antigravity.py
03/25/2019 08:21 PM 95,103 argparse.py
03/25/2019 08:21 PM 12,575 ast.py
03/25/2019 08:21 PM 11,328 asynchat.py
06/27/2019 04:29 AM <DIR> asyncio
03/25/2019 08:21 PM 20,118 asyncore.py
03/25/2019 08:21 PM 20,380 base64.py
03/25/2019 08:21 PM 31,489 bdb.py
03/25/2019 08:21 PM 13,954 binhex.py
03/25/2019 08:21 PM 2,557 bisect.py
03/25/2019 08:21 PM 12,410 bz2.py
03/25/2019 08:21 PM 24,826 calendar.py
03/25/2019 08:21 PM 34,549 cgi.py
03/25/2019 08:21 PM 12,018 cgitb.py
03/25/2019 08:21 PM 5,435 chunk.py
03/25/2019 08:21 PM 14,860 cmd.py
03/25/2019 08:21 PM 10,619 code.py
03/25/2019 08:21 PM 36,287 codecs.py
03/25/2019 08:21 PM 5,994 codeop.py
06/27/2019 04:29 AM <DIR> collections
03/25/2019 08:21 PM 4,064 colorsys.py
03/25/2019 08:21 PM 13,649 compileall.py
06/27/2019 04:29 AM <DIR> concurrent
03/25/2019 08:21 PM 54,283 configparser.py
03/25/2019 08:21 PM 23,774 contextlib.py
03/25/2019 08:21 PM 129 contextvars.py
03/25/2019 08:21 PM 8,815 copy.py
03/25/2019 08:21 PM 7,017 copyreg.py
03/25/2019 08:21 PM 5,805 cProfile.py
03/25/2019 08:21 PM 3,346 crypt.py
03/25/2019 08:21 PM 16,180 csv.py
06/27/2019 04:29 AM <DIR> ctypes
06/27/2019 04:29 AM <DIR> curses
03/25/2019 08:21 PM 48,508 dataclasses.py
03/25/2019 08:21 PM 86,298 datetime.py
06/27/2019 04:29 AM <DIR> dbm
03/25/2019 08:21 PM 320 decimal.py
03/25/2019 08:21 PM 84,387 difflib.py
03/25/2019 08:21 PM 19,888 dis.py
06/27/2019 04:29 AM <DIR> distutils
03/25/2019 08:21 PM 104,284 doctest.py
03/25/2019 08:21 PM 2,815 dummy_threading.py
06/27/2019 04:29 AM <DIR> email
06/27/2019 04:29 AM <DIR> encodings
06/27/2019 04:29 AM <DIR> ensurepip
03/25/2019 08:21 PM 34,778 enum.py
03/25/2019 08:21 PM 9,830 filecmp.py
03/25/2019 08:21 PM 14,568 fileinput.py
03/25/2019 08:21 PM 4,056 fnmatch.py
03/25/2019 08:21 PM 15,143 formatter.py
03/25/2019 08:21 PM 23,639 fractions.py
03/25/2019 08:21 PM 35,257 ftplib.py
03/25/2019 08:21 PM 32,441 functools.py
03/25/2019 08:21 PM 4,756 genericpath.py
03/25/2019 08:21 PM 7,489 getopt.py
03/25/2019 08:21 PM 5,994 getpass.py
03/25/2019 08:21 PM 21,967 gettext.py
03/25/2019 08:21 PM 5,638 glob.py
03/25/2019 08:21 PM 20,338 gzip.py
03/25/2019 08:21 PM 9,534 hashlib.py
03/25/2019 08:21 PM 23,017 heapq.py
03/25/2019 08:21 PM 6,517 hmac.py
06/27/2019 04:29 AM <DIR> html
06/27/2019 04:29 AM <DIR> http
06/27/2019 04:29 AM <DIR> idlelib
03/25/2019 08:21 PM 53,292 imaplib.py
03/25/2019 08:21 PM 3,795 imghdr.py
03/25/2019 08:21 PM 10,536 imp.py
06/27/2019 04:29 AM <DIR> importlib
03/25/2019 08:21 PM 117,615 inspect.py
03/25/2019 08:21 PM 3,517 io.py
03/25/2019 08:21 PM 75,072 ipaddress.py
06/27/2019 04:29 AM <DIR> json
03/25/2019 08:21 PM 2,245 keyword.py
06/27/2019 04:29 AM <DIR> lib2to3
03/25/2019 08:21 PM 5,312 linecache.py
03/25/2019 08:21 PM 78,027 locale.py
06/27/2019 04:29 AM <DIR> logging
03/25/2019 08:21 PM 12,983 lzma.py
03/25/2019 08:21 PM 6,123 macpath.py
03/25/2019 08:21 PM 78,654 mailbox.py
03/25/2019 08:21 PM 8,104 mailcap.py
03/25/2019 08:21 PM 20,880 mimetypes.py
03/25/2019 08:21 PM 23,035 modulefinder.py
06/27/2019 04:29 AM <DIR> msilib
06/27/2019 04:29 AM <DIR> multiprocessing
03/25/2019 08:21 PM 5,566 netrc.py
03/25/2019 08:21 PM 43,088 nntplib.py
03/25/2019 08:21 PM 22,340 ntpath.py
03/25/2019 08:21 PM 2,584 nturl2path.py
03/25/2019 08:21 PM 10,244 numbers.py
03/25/2019 08:21 PM 5,824 opcode.py
03/25/2019 08:21 PM 10,863 operator.py
03/25/2019 08:21 PM 60,371 optparse.py
03/25/2019 08:21 PM 37,756 os.py
03/25/2019 08:21 PM 49,389 pathlib.py
03/25/2019 08:21 PM 62,544 pdb.py
03/25/2019 08:21 PM 57,837 pickle.py
03/25/2019 08:21 PM 91,220 pickletools.py
03/25/2019 08:21 PM 8,916 pipes.py
03/25/2019 08:21 PM 21,461 pkgutil.py
04/24/2019 07:46 PM 47,067 platform.py
03/25/2019 08:21 PM 29,885 plistlib.py
03/25/2019 08:21 PM 14,964 poplib.py
03/25/2019 08:21 PM 15,772 posixpath.py
03/25/2019 08:21 PM 20,884 pprint.py
03/25/2019 08:21 PM 22,046 profile.py
03/25/2019 08:21 PM 27,313 pstats.py
03/25/2019 08:21 PM 4,763 pty.py
03/25/2019 08:21 PM 15,137 pyclbr.py
03/25/2019 08:21 PM 106,731 pydoc.py
06/27/2019 04:29 AM <DIR> pydoc_data
03/25/2019 08:21 PM 8,001 py_compile.py
03/25/2019 08:21 PM 11,359 queue.py
03/25/2019 08:21 PM 7,254 quopri.py
03/25/2019 08:21 PM 27,557 random.py
03/25/2019 08:21 PM 15,192 re.py
03/25/2019 08:21 PM 5,267 reprlib.py
03/25/2019 08:21 PM 7,097 rlcompleter.py
03/25/2019 08:21 PM 11,959 runpy.py
03/25/2019 08:21 PM 6,442 sched.py
03/25/2019 08:21 PM 2,038 secrets.py
03/25/2019 08:21 PM 18,561 selectors.py
03/25/2019 08:21 PM 8,527 shelve.py
03/25/2019 08:21 PM 12,956 shlex.py
03/25/2019 08:21 PM 41,329 shutil.py
03/25/2019 08:21 PM 2,123 signal.py
06/27/2019 04:29 AM <DIR> site-packages
03/25/2019 08:21 PM 21,649 site.py
03/25/2019 08:21 PM 34,711 smtpd.py
03/25/2019 08:21 PM 44,210 smtplib.py
03/25/2019 08:21 PM 7,086 sndhdr.py
03/25/2019 08:21 PM 27,363 socket.py
03/25/2019 08:21 PM 26,922 socketserver.py
06/27/2019 04:29 AM <DIR> sqlite3
03/25/2019 08:21 PM 26,872 sre_compile.py
03/25/2019 08:21 PM 7,177 sre_constants.py
03/25/2019 08:21 PM 39,305 sre_parse.py
03/25/2019 08:21 PM 45,432 ssl.py
03/25/2019 08:21 PM 5,038 stat.py
03/25/2019 08:21 PM 20,651 statistics.py
03/25/2019 08:21 PM 11,564 string.py
03/25/2019 08:21 PM 12,917 stringprep.py
03/25/2019 08:21 PM 257 struct.py
03/25/2019 08:21 PM 69,966 subprocess.py
03/25/2019 08:21 PM 18,375 sunau.py
03/25/2019 08:21 PM 2,131 symbol.py
03/25/2019 08:21 PM 7,274 symtable.py
04/24/2019 07:46 PM 24,649 sysconfig.py
03/25/2019 08:21 PM 24,317 sysconfig.py.orig
03/25/2019 08:21 PM 11,408 tabnanny.py
03/25/2019 08:21 PM 92,617 tarfile.py
03/25/2019 08:21 PM 23,135 telnetlib.py
03/25/2019 08:21 PM 26,710 tempfile.py
06/27/2019 04:29 AM <DIR> test
03/25/2019 08:21 PM 19,494 textwrap.py
03/25/2019 08:21 PM 1,003 this.py
03/25/2019 08:21 PM 48,104 threading.py
03/25/2019 08:21 PM 13,444 timeit.py
06/27/2019 04:29 AM <DIR> tkinter
03/25/2019 08:21 PM 3,763 token.py
03/25/2019 08:21 PM 27,030 tokenize.py
03/25/2019 08:21 PM 28,543 trace.py
03/25/2019 08:21 PM 23,438 traceback.py
03/25/2019 08:21 PM 17,076 tracemalloc.py
03/25/2019 08:21 PM 879 tty.py
03/25/2019 08:21 PM 143,602 turtle.py
06/27/2019 04:29 AM <DIR> turtledemo
03/25/2019 08:21 PM 9,897 types.py
03/25/2019 08:21 PM 54,602 typing.py
06/27/2019 04:29 AM <DIR> unittest
06/27/2019 04:29 AM <DIR> urllib
03/25/2019 08:21 PM 6,816 uu.py
03/25/2019 08:21 PM 29,449 uuid.py
06/27/2019 04:29 AM <DIR> venv
03/25/2019 08:21 PM 20,242 warnings.py
03/25/2019 08:21 PM 18,229 wave.py
03/25/2019 08:21 PM 20,689 weakref.py
03/25/2019 08:21 PM 23,097 webbrowser.py
06/27/2019 04:29 AM <DIR> wsgiref
03/25/2019 08:21 PM 5,913 xdrlib.py
06/27/2019 04:29 AM <DIR> xml
06/27/2019 04:29 AM <DIR> xmlrpc
03/25/2019 08:21 PM 7,535 zipapp.py
03/25/2019 08:21 PM 80,379 zipfile.py
03/25/2019 08:21 PM 1,801 _bootlocale.py
03/25/2019 08:21 PM 26,424 _collections_abc.py
03/25/2019 08:21 PM 8,749 _compat_pickle.py
03/25/2019 08:21 PM 5,340 _compression.py
03/25/2019 08:21 PM 5,117 _dummy_thread.py
03/25/2019 08:21 PM 14,598 _markupbase.py
03/25/2019 08:21 PM 19,138 _osx_support.py
03/25/2019 08:21 PM 228,535 _pydecimal.py
03/25/2019 08:21 PM 91,166 _pyio.py
03/25/2019 08:21 PM 6,186 _py_abc.py
03/25/2019 08:21 PM 3,115 _sitebuiltins.py
03/25/2019 08:21 PM 25,504 _strptime.py
03/25/2019 08:21 PM 7,214 _threading_local.py
03/25/2019 08:21 PM 5,679 _weakrefset.py
03/25/2019 08:21 PM 5,101 __future__.py
03/25/2019 08:21 PM 64 __phello__.foo.py
06/27/2019 04:29 AM <DIR> __pycache__
172 File(s) 4,330,005 bytes
34 Dir(s) 69,282,762,752 bytes free
"\Lib\site-packages"
Volume in drive D is Temporary Storage
Volume Serial Number is 2AF3-E29E
Directory of D:\batch\tasks\shared\test-condaenv-users\Lib\site-packages
06/27/2019 04:29 AM <DIR> .
06/27/2019 04:29 AM <DIR> ..
06/27/2019 04:29 AM <DIR> certifi
06/20/2019 10:54 PM 2,990 certifi-2019.06.16-py3.7.egg-info
04/23/2019 01:18 AM 126 easy_install.py
06/27/2019 04:29 AM <DIR> pip
06/27/2019 04:29 AM <DIR> pip-19.1.1-py3.7.egg-info
06/27/2019 04:29 AM <DIR> pkg_resources
03/25/2019 08:21 PM 119 README.txt
06/27/2019 04:29 AM <DIR> setuptools
06/27/2019 04:29 AM <DIR> setuptools-41.0.1-py3.7.egg-info
06/27/2019 04:29 AM <DIR> wheel
06/27/2019 04:29 AM <DIR> wheel-0.33.4-py3.7.egg-info
06/28/2018 10:27 PM 5,788 wincertstore-0.2-py3.7.egg-info
10/23/2013 07:30 AM 11,873 wincertstore.py
06/27/2019 04:29 AM <DIR> __pycache__
5 File(s) 20,896 bytes
11 Dir(s) 69,282,762,752 bytes free
Directory of D:\batch\tasks\shared\test-condaenv-users\Library
06/27/2019 04:29 AM <DIR> .
06/27/2019 04:29 AM <DIR> ..
06/27/2019 04:29 AM <DIR> bin
05/29/2019 06:11 PM 412 ct_log_list.cnf
05/29/2019 06:11 PM 412 ct_log_list.cnf.dist
06/27/2019 04:29 AM <DIR> include
06/27/2019 04:29 AM <DIR> lib
06/27/2019 04:29 AM <DIR> misc
05/29/2019 06:11 PM 10,909 openssl.cnf
05/29/2019 06:11 PM 10,909 openssl.cnf.dist
06/27/2019 04:29 AM <DIR> ssl
4 File(s) 22,642 bytes
7 Dir(s) 69,282,762,752 bytes free
"\Library\bin"
Volume in drive D is Temporary Storage
Volume Serial Number is 2AF3-E29E
Directory of D:\batch\tasks\shared\test-condaenv-users\Library\bin
06/27/2019 04:29 AM <DIR> .
06/27/2019 04:29 AM <DIR> ..
04/20/2018 01:28 PM 19,208 api-ms-win-core-console-l1-1-0.dll
04/20/2018 01:28 PM 18,696 api-ms-win-core-datetime-l1-1-0.dll
04/20/2018 01:28 PM 18,696 api-ms-win-core-debug-l1-1-0.dll
04/20/2018 01:28 PM 18,696 api-ms-win-core-errorhandling-l1-1-0.dll
04/20/2018 01:29 PM 22,280 api-ms-win-core-file-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-file-l1-2-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-file-l2-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-handle-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-heap-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-interlocked-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-core-libraryloader-l1-1-0.dll
04/20/2018 01:37 PM 21,256 api-ms-win-core-localization-l1-2-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-memory-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-namedpipe-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-core-processenvironment-l1-1-0.dll
04/20/2018 01:37 PM 20,744 api-ms-win-core-processthreads-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-processthreads-l1-1-1.dll
04/20/2018 01:37 PM 18,184 api-ms-win-core-profile-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-rtlsupport-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-string-l1-1-0.dll
04/20/2018 01:37 PM 20,744 api-ms-win-core-synch-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-synch-l1-2-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-core-sysinfo-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-core-timezone-l1-1-0.dll
04/20/2018 01:37 PM 18,696 api-ms-win-core-util-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-crt-conio-l1-1-0.dll
04/20/2018 01:37 PM 22,792 api-ms-win-crt-convert-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-crt-environment-l1-1-0.dll
04/20/2018 01:37 PM 20,744 api-ms-win-crt-filesystem-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-crt-heap-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-crt-locale-l1-1-0.dll
04/20/2018 01:37 PM 27,912 api-ms-win-crt-math-l1-1-0.dll
04/20/2018 01:37 PM 26,888 api-ms-win-crt-multibyte-l1-1-0.dll
04/20/2018 01:37 PM 71,432 api-ms-win-crt-private-l1-1-0.dll
04/20/2018 01:37 PM 19,720 api-ms-win-crt-process-l1-1-0.dll
04/20/2018 01:37 PM 23,304 api-ms-win-crt-runtime-l1-1-0.dll
04/20/2018 01:37 PM 24,840 api-ms-win-crt-stdio-l1-1-0.dll
04/20/2018 01:37 PM 24,840 api-ms-win-crt-string-l1-1-0.dll
04/20/2018 01:37 PM 21,256 api-ms-win-crt-time-l1-1-0.dll
04/20/2018 01:37 PM 19,208 api-ms-win-crt-utility-l1-1-0.dll
11/13/2018 04:56 PM 329,368 concrt140.dll
06/27/2019 04:29 AM 6,548 c_rehash.pl
05/29/2019 06:11 PM 3,407,360 libcrypto-1_1-x64.dll
05/29/2019 06:11 PM 10,088,448 libcrypto-1_1-x64.pdb
05/29/2019 06:11 PM 681,472 libssl-1_1-x64.dll
05/29/2019 06:11 PM 2,322,432 libssl-1_1-x64.pdb
11/13/2018 04:56 PM 625,808 msvcp140.dll
11/13/2018 04:56 PM 31,896 msvcp140_1.dll
11/13/2018 04:56 PM 195,248 msvcp140_2.dll
05/29/2019 06:11 PM 542,720 openssl.exe
05/29/2019 06:11 PM 2,527,232 openssl.pdb
04/22/2019 06:33 PM 1,028,608 sqlite3.dll
04/22/2019 06:33 PM 1,303,552 sqlite3.exe
04/20/2018 01:37 PM 1,016,584 ucrtbase.dll
11/13/2018 04:56 PM 386,720 vccorlib140.dll
11/13/2018 04:56 PM 155,280 vcomp140.dll
11/13/2018 04:56 PM 87,200 vcruntime140.dll
57 File(s) 25,601,052 bytes
2 Dir(s) 69,282,762,752 bytes free
Volume in drive D is Temporary Storage
Volume Serial Number is 2AF3-E29E
Directory of D:\batch\tasks\shared\test-condaenv-users\libs
06/27/2019 04:29 AM <DIR> .
06/27/2019 04:29 AM <DIR> ..
04/24/2019 08:30 PM 170,564 python3.lib
04/24/2019 08:29 PM 342,616 python37.lib
04/24/2019 08:30 PM 1,750 _tkinter.lib
3 File(s) 514,930 bytes
2 Dir(s) 69,282,762,752 bytes free
是char c = 43 + signbit(n) * 2 ;
char 43是'+' char 45，转换为'-' true包含在cmath in C++和math.h in C