c******m 发帖数: 5 | 1 I have some bit map string, I want to know which bit is 1.
For example
switch(bitvec)
{
case 0x0L:
return -1;
case 0x1L:
return 0;
case 0x2L:
return 1;
case 0x4L:
return 2;
case 0x8L:
r |
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t****t 发帖数: 6806 | 2 "number of bits set" means "number of bits (that are) set"
英文太差了
and |
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b*********n 发帖数: 1258 | 3 64 bit下的int也是4 bytes?
那就和32 bit下的int一样了,对吗? |
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k***r 发帖数: 4260 | 4 If I compile from source, it always compiles to 64 bit.
So I guess I'll need to install 32 bit binaries. If I
install with RPM, doesn't it always go to the default
directories? Or is there a way for me to specify that?
e.g. / |
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k***r 发帖数: 4260 | 5 The difference is, I wasn't sure (still am not) what I need
to install on the 64 bit machine to compile. I use python's
configure and make and I didn't really want to mess with
the generated Makefile. Maybe it's easy. Maybe I should give
it a try next time.
It seems that in my case, the /usr/local/lib/python2.5 files
are all for 64 bit. I checked with file and confirmed this.
specify the
default.
"file". |
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t****t 发帖数: 6806 | 6 it's rarely need to mess with the "configure" generated Makefile.
in your case, you can do
configure --prefix=/usr/local32
env CC="gcc -m32" make
make install
also, i believe */lib/python2.*/* is so called python byte-compiled file and
doesn't matter whether it's 32-bit or 64-bit... |
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d***a 发帖数: 13752 | 7 一般都可以吧。如果要开发很大的系统,那应该上64-bit,用大内存。 |
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y****e 发帖数: 23939 | 8 是呀,这个没什么好选的吧。还有大内存的支持。我的笔记本都是32GB,用32位就是浪
费了。
bit |
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a*w 发帖数: 4495 | 9 在32位机上也可以cross compile 64位程序。
bit |
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r*********e 发帖数: 20 | 10 最近遇到一个字符串处理的题,要求是必须保证8 bit clean,传进来的字符串是const
unsigned char*, 我想把它转成std::string 然后一个个字符来处理,请问这样做的
话还是8 bit clean吗? |
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B*****s 发帖数: 45 | 11 I bought Dell Dimension 9200 with quad core. The Operating system turned out
to be a 32-bit vista. Do dell sell 64-bit OEM version of vista? |
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g*******t 发帖数: 1039 | 12 should I install the 64-bit edition, if I got a amd 64 cpu, but all my
applications are 32-bit.
you suggestions will be appreciated! |
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d******a 发帖数: 32122 | 13 看了几个,并不支持xp 64-bit 但是支持vista 64-bit |
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R*******i 发帖数: 99 | 14 【 以下文字转载自 HiFi 讨论区 】
发信人: Rossoneri (Forza Milan), 信区: HiFi
标 题: Vista Ultimate 64 Bit - 用什么卡拉OK软件?
发信站: BBS 未名空间站 (Fri Jan 2 17:40:04 2009)
想装一个HTPC,用Vista Ultimate 64 Bit (有Media Center组件)。卡拉OK应该怎么
实现呢? |
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d*******s 发帖数: 28 | 15 I am trying to install flash player to a 64 bit xp sp2. Tried with 32 bit
browser but unsuccessful. Any instruction how to install the flash or it can
not be done? |
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y***n 发帖数: 2318 | 16 I once tried Vista 64-bit on a 4GB PC, and I remember it left about 3GB RAM
as free(some services like Server turned off).
I heard Windows 7 occupies less resource, just wonder how much RAM is free
for the 64-bit version?
Please advise,thank you. |
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m*****e 发帖数: 4193 | 17 【 以下文字转载自 SanFrancisco 讨论区 】
发信人: microbe (纵使相逢应不识), 信区: SanFrancisco
标 题: 你们有谁装了64-bit的Windows么?
发信站: BBS 未名空间站 (Mon Jun 22 02:23:33 2009, 美东)
兼容性怎么样,比如装游戏或者Daemon Tools这样的东东。
现在32-bit只能用3G内存,不爽。 |
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o******d 发帖数: 1552 | 18 大多数32-bit应用都可以跑在64-bit系统上。 |
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g*g 发帖数: 6908 | 19 原来在win7 64 和32上面都装过没问题,无论是64/32的IE,还是32的ff
最近在一台新机器上,IE的flash没问题。死活给ff装不上了
OEM win 7 64bit
firefox 7.0.1 (32 bit)
去adobe网上下载了flash for win 7 64 bit, other browsers
运行这个install_flashplayer11x64_mssd_aih
不停在appdata/local/temp里出现install_flashplayer11x64_mssd_aih_1, install_
flashplayer11x64_mssd_aih_1_1_1_1....等临时文件,但是安装界面没能出现(比如
安装程序到adobe下载完整程序之类的)
还是习惯用firefox了,大家给出个主意,怎么回事呢? |
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m**j 发帖数: 213 | 20 本来是3GB windows xp,后来升级到windows 7 64-bit,换成了2x2G ram
如果关机或者hibernation时间很长,按power键每个小灯LED会亮一遍,但最后只有(z)
和电池,电源LED亮着,机器无响应,press * hold power键彻底关机,在boot( 1 or
more times)就可以了。
一旦运行起来,机器没任何问题。我怀疑是不是静电 or Memory / Bios issue?
我怀疑是mem插槽问题?我把原先的1G 2G对换插槽,就很难启动,又买2个2x2G,结果
就启动不起来。我换ram没带防静电手套/wire,但这个症状也太奇怪了
我换成3GB + windows 7 32-bit,一点问题没有。
T400支持2x4GB max ram.
谁有类似问题?3x |
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f*****0 发帖数: 489 | 21 I just received 30 32bit mcus. those are 50mhz parts, 32bit risc mcus
running at 50mhz, 32k flash / 8k sram, one channel of ssi, one channel of
i2c, 8 channels of 10-bit adc running at 1 million samples per second.
60mips and 100mw in power dissipation.
for those chips, I paid more for shipping than for the chips themselves.
whoever is still programming 8/16 bit mcus must be concerned because their
days are numbered. |
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w**i 发帖数: 136 | 22 I did not say there is no market for 32 bit MCUs. In my previous post, I
just gave an example which might possibly shake your conclusion. Take a
detailed example, say an Orman blood pressure monitor, which is quite
popular in Market. Do you think it is necessary to add fancy functions with
32 bits MCUS for the current products if you were the CEO of Orman? If there
is any improvement needed to be done in their system, modification is
enough. That is the reason I believe it is a long run before 8 |
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f*****0 发帖数: 489 | 23
I don't think performance is the reason for the proliferation of low-end
32-bit devices. obviously it helps. take a software-based vga display
for example. at 480 bit horizontal resolution, and 2 instructions per
second (to load up data), you need a mcu capable of 480*2/25us = 40mips.
that translates into a 160mhz PIC 8bit mcu - it doesn't exist. a 50mhz
32bit cortex-m3 chip (capable of 60mips+) can easily do that.
what will drive people to 32bit mcus is easier software development: the
ability |
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f*****0 发帖数: 489 | 24
true. they did a good job marketing the cortex-m3 architecture to compete
with the 8/16 bit mcus.
I am moving up from the pic world, and struggled with the arm7's way of
setting / clearing the gpio. and the bit banding on the cortex-m3 is a big
help for me.
they have a pretty good portfolio now and covers pretty much anything that
a typical 8/16bit mcu can do. |
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s******8 发帖数: 164 | 25 cos(2pi*f*t)的带宽是多少?
一种说法是f,另一种说法是0。
带宽单位到底是Hz(rad)还是bit/s?
计算机专业的人不学通信原理只学上层的计算机网络原理,计算机网络一般只研究信息
传输速率而不涉及通信原理中傅立叶变换功率谱密度那套东西,所以他们认为带宽单位
就是bit/s;通信专业的人学了通信原理,里面没完没了地研究传输信号功率谱或者频
谱的宽度,所以他们认为带宽的单位是Hz(rad)。
到底谁对? |
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k*******d 发帖数: 1340 | 26 我觉得是0
因为“带宽”有两种不同的含义,所以有时候用bit/s,有时候用hz, 用bit/s的时候的
意思是data rate,用Hz的时候是频谱上占用的频带的宽度
楼主提得两种理解都是对的,要看上下文来决定到底指的是哪个含义 |
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S******y 发帖数: 1123 | 27 I have a 64-bit windows box -
Intel Xeon CPU E7340 @ 2.4GHz 31.9GB of RAM
I have R 2.11.1 (64bit) running on it.
My csv data is 3.6 GB (with about 15 million obs, 120 variables.) |
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I*M 发帖数: 30 | 28 就重新装了64-bit office, 还是不行,显示error:class not registered, error in
the libname statement. 请问怎么才能让它connect 啊, 需要重新装回32-bit
office, install PC files server吗?多谢 |
|
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u**o 发帖数: 4652 | 30 I Support him as BIT board needs some fresh blood.
ColinFirth seems enthusiastic about BIT board. |
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m*********k 发帖数: 10521 | 31 [BIT版征文]我的大学
200*16=3200
成功奖励 200 伪币的用户: xinmajia2009, lllllloooooo, woodstock001, pious,
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成功扣除 3000 伪币的用户: mitbbs
扣除版面:(BIT)200伪币成功 |
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m*********k 发帖数: 10521 | 33 [BIT]
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1.png
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