C课程项目 [英] C Lessons Project
问题描述
从我发现的这些日常课程中学习C编程。他们已经十一天了，所以你们已经很忙了......
http://www.visualcmaniac.com
Learn C programming from these daily lessons I found. They''re eleven
days ahead of you already so get busy...
http://www.visualcmaniac.com
推荐答案
vu*****@gmail.com 写道：
从这些日常课程中学习C编程我发现。他们已经提前11天了，所以忙着......
http://www.visualcmaniac.com
不要！除非你想学习如何写*坏* C类程序。
这就是为什么（课程12）：
#include< stdio.h>
#include< math.h>
没有必要包含math.h，因为它未在下面使用
void main（）{
在此之后，所有投注都已关闭。看着粉红色的猪爬出你的耳朵
（未定义的行为，`main`必须返回'int`）。
int i，n，prime = 1; // prime是真的
这样的评论在C99中没问题。
printf（"输入自然数："）;
不使用\ n终止`printf`使得
实现可以不打印任何内容（至少不在firts之前\ n
它看到了。）
scanf（"％d"，& n）;
无错误检查。如果用户输入的内容不是整数，那该怎么办？
即使输入了整数，如果它是负数呢？
for（i = 2; i< ; = n-1; i ++）{
if（n％i == 0）{//也可以陈述if（！（n％i））
更好地适当地加括号：
if（（n％i）== 0）{//也可以
状态if（ ！（n％i））
prime = 0; //素数现在是假的
休息;
}
如果（素数）
printf（" ％d是素数！\ n"，n）;
其他
printf（"％d不是素数！\ n，n ）;
}
Learn C programming from these daily lessons I found. They''re eleven
days ahead of you already so get busy...
http://www.visualcmaniac.com
DON''T! Unless you want to learn how to write *bad* C-like programs.
And here''s why ("Lesson" 12):
#include <stdio.h>
#include <math.h>
Not necessary to include math.h as it''s not used below
void main() {
After this, all bets are off. Watch pink pigs crawl out your ears
(undefined behaviour, `main` has to return `int`).
int i, n, prime=1; // prime is true
Comments like these are OK in C99.
printf("Input natural number :");
Not terminating `printf` with \n makes it possible for the
implementation to NOT print anything out (at least not before firts \n
it sees).
scanf("%d", &n);
No error checking. What if user enters something that''s not an integer.
Even if integer is entered, what if it''s negative?
for( i=2; i<= n-1; i++) {
if( n % i == 0 ) { // also possible to state if(!(n % i))
Much better to parenthesise appropriatelly:
if( (n % i) == 0 ) { // also possible to
state if(!(n % i))
prime =0; // prime is now false
break;
}
}
if( prime )
printf("%d is prime number !\n", n);
else
printf("%d isn''t prime number!\n", n);
}
间距很糟糕（或者如果你愿意的话，也很邋。）。
我没有检查所使用的算法是否也是正确的。
Spacing is atrocious (or sloppy, if you will).
I didn''t check whether the algorithmu used is actually correct either.
vu ***** @ gmail.com 说：
从我发现的这些日常课程中学习C编程。他们已经提前11天了，所以忙着......
http://www.visualcmaniac.com
Learn C programming from these daily lessons I found. They''re eleven
days ahead of you already so get busy...
http://www.visualcmaniac.com
如果这些课程应该教授C，那么它们就会失败。如果他们应该给某些特定于平台的C版本教授，那么他们在这里是偏离主题的。
-
Richard Heathfield
Usenet是一个奇怪的地方 - dmr 29/7/1999
http://www.cpax.org.uk
电子邮件：rjh在上面的域名（但显然放弃了www）
If these lessons are supposed to teach C, they fail. If they are supposed to
teach some platform-specific variant of C, they are off-topic here.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)
Vladimir S. Oka写道：
Vladimir S. Oka wrote:
vu*****@gmail.com 写道：
学习C从我发现的这些日常课程编程。他们已经提前11天了，所以忙着......
http://www.visualcmaniac.com
Learn C programming from these daily lessons I found. They''re eleven
days ahead of you already so get busy...
http://www.visualcmaniac.com
这样的评论在C99中没问题。
Comments like these are OK in C99.
printf（" Input）自然数："）;
printf("Input natural number :");
不使用\ n终止`printf`使
实现无法打印出任何内容（至少在打印之前不会打印出来） \\ n
它看到了。）
Not terminating `printf` with \n makes it possible for the
implementation to NOT print anything out (at least not before firts \n
it sees).
< snip>
你能解释一下吗...好像你说的那样，比如说，
printf（输入一个数字>）;
可能会导致在printf没有输出任何东西？
-
==============
*不是学究者*
==============
<snip>
Could you explain this please ... seems like you''re saying that, say,
printf("Enter a number >");
might result in printf not outputting anything?
--
==============
*Not a pedant*
==============
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