功能 [英] function
问题描述
我正在尝试编写一个实用程序，它将一个文件名作为参数1来写入
写入，并且作为参数2将num作为一个零来写一个
参数1.零文件。这是我有多远。为什么我要一个零的
文件？安装到环回设备。
#include< stdio.h>
#include< stdlib.h>
int
main（int argc，char * argv []）
{
if（argc！= 3）
{
put（使用错误）;
退出（EXIT_FAILURE）;
}
char a =''0'';
int b，num;
FILE * fp;
num = atoi （argv [2]）;
fp = fopen（argv [1]，" wb"）;
我想我需要一个for循环涉及到某处。我是
不知道放在身上的是什么。
比尔
I am trying to write a utility that takes as argument 1 a file name to
write to and as argument 2 takes num as a number of zeros to write a
argument 1. A file of zeros. This is how far I have got. Why would I want a
file of zeros? To mount to a loopback device.
#include <stdio.h>
#include <stdlib.h>
int
main (int argc, char *argv[])
{
if (argc != 3)
{
puts ("usage error");
exit (EXIT_FAILURE);
}
char a = ''0'';
int b, num;
FILE *fp;
num = atoi (argv[2]);
fp = fopen (argv[1], "wb");
I am thinking that I would need a for loop involved here somewhere. I am
not sure what to put in the body.
Bill
推荐答案
Bill Cunningham写道：
Bill Cunningham wrote:
我正在尝试编写一个实用程序，将一个文件作为参数1
写入的名称和因为参数2将num作为零的数量来表示
写一个参数1.一个零的文件。这是我有多远。为什么
我想要一个零文件？安装到环回设备。
I am trying to write a utility that takes as argument 1 a file
name to write to and as argument 2 takes num as a number of zeros to
write a argument 1. A file of zeros. This is how far I have got. Why
would I want a file of zeros? To mount to a loopback device.
[OT]
dd if = / dev / zero of =< your filecount =< your size>
[/ OT]
[OT]
dd if=/dev/zero of=<your filecount=<your size>
[/OT]
#include< stdio.h>
#include< stdlib.h>
int
main（int argc，char * argv []）
{
if（argc ！= 3）
{
put（使用错误）;
退出（EXIT_FAILURE）;
}
char a =''0'';
#include <stdio.h>
#include <stdlib.h>
int
main (int argc, char *argv[])
{
if (argc != 3)
{
puts ("usage error");
exit (EXIT_FAILURE);
}
char a = ''0'';
char a =''\ 0'';
char a = ''\0'';
int b，num;
FILE * fp;
num = atoi（argv [2]）;
fp = fopen（argv [1]，" wb"） ;
我在想这里需要一个for循环
。我不知道该放入体内。
int b, num;
FILE *fp;
num = atoi (argv[2]);
fp = fopen (argv[1], "wb");
I am thinking that I would need a for loop involved here
somewhere. I am not sure what to put in the body.
while（num--）
fputc（a，fp）;
fclose（fp）;
返回0;
}
仍然需要一些错误检查（num> = 0，fp！= NULL，fclose和fput工作）
while (num--)
fputc(a, fp);
fclose(fp);
return 0;
}
Still needs some error checking (num>=0, fp != NULL, fclose and fput worked)
Bill
Bill
再见，Jojo
Bye, Jojo
" Joachim Schmitz" < no ********* @ schmitz-digital.dewrote in message
news：g1 ********** @ online.de ...
"Joachim Schmitz" <no*********@schmitz-digital.dewrote in message
news:g1**********@online.de...
[OT]
dd if = / dev / zero of =< your filecount =< your size>
[/ OT]
[OT]
dd if=/dev/zero of=<your filecount=<your size>
[/OT]
啊。简单的方法:)
Ah. The easy way out :)
> #include< stdio.h>
#include< stdlib。 h>
主要（int argc，char * argv []）
{
if（argc！= 3）
{
puts（使用错误）;
退出（EXIT_FAILURE）;
}
char a =''0'';
>#include <stdio.h>
#include <stdlib.h>
int
main (int argc, char *argv[])
{
if (argc != 3)
{
puts ("usage error");
exit (EXIT_FAILURE);
}
char a = ''0'';
char a =''\''';
char a = ''\0'';
为什么终止字符串字符？你的意思是更换我的线路吗？
你要加一个吗？
Why the termination string character? Do you mean to replace my line or
are you adding one?
> int b，num;
FILE * fp;
num = atoi（argv [2]）;
fp = fopen（argv [1]，" wb"）;
我在想，我需要在这里涉及到一个for循环
。我不知道该放入体内。
> int b, num;
FILE *fp;
num = atoi (argv[2]);
fp = fopen (argv[1], "wb");
I am thinking that I would need a for loop involved here
somewhere. I am not sure what to put in the body.
while（num--）
fputc（a，fp）;
fclose（fp）;
返回0;
}
仍然需要一些错误检查（num> = 0，fp！= NULL，fclose和fput
工作）
while (num--)
fputc(a, fp);
fclose(fp);
return 0;
}
Still needs some error checking (num>=0, fp != NULL, fclose and fput
worked)
我可以得到那个部分。我想。
I can get that part. I think.
> Bill
>Bill
再见，Jojo
Bye, Jojo
" Joachim Schmitz" < no ********* @ schmitz-digital.dewrote in message
news：g1 ********** @ online.de ...
[snip]
"Joachim Schmitz" <no*********@schmitz-digital.dewrote in message
news:g1**********@online.de...
[snip]
while（num--）fputc（a，fp）;
fclose（fp）;
返回0;
}
仍需要一些错误检查（num> = 0，fp！ = NULL，fclose和fput
工作）
while (num--) fputc(a, fp);
fclose(fp);
return 0;
}
Still needs some error checking (num>=0, fp != NULL, fclose and fput
worked)
> Bill
>Bill
再见，Jojo
Bye, Jojo
虽然（num--）这是什么？这和我在这里想的一样。
int c;
for（c = 1; c< num; c ++）
Bill
While(num--) What''s that? Is that the same as what I was thinking here.
int c;
for(c=1;c<num;c++)
Bill
这篇关于功能的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
